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REVISED 2004
Pharmacy
Pamela D. Young, PharmD
Infectious Diseases Antimicrobial Clinical University of Louisville Hospital Louisville, Kentucky NOTE for opening page: This chapter contains information presented by Patricia A. Montgomery and Laura A. Cornish in Chapter 68 of the 2002 edition of the APIC Text of Infection Control and Epidemiology. ABSTRACT
Patient morbidity and mortality can result from contaminated
pharmaceuticals. Pharmacy is responsible for preparation and
storage of most sterile medication. It may be necessary for
pharmacy personnel to participate in identifying patients who
have received specific products associated with epidemics.
Pharmacy personnel are responsible for coordinating recalls of
pharmaceutical preparations, such as occurs in cases of
intrinsic contamination. The pharmacy department should participate
in multidisciplinary activities such as quality assurance
teams, infection control committees, and antimicrobial use programs
to ensure appropriate preparation and use of pharmaceuticals.
KEY CONCEPTS
Risks associated with contamination of sterile products
Modes of contamination of sterile pharmaceutical products Methods for preventing contamination of sterile products Pharmacy responsibilities involving antimicrobial control
I. BACKGROUND
Patient morbidity and mortality can result from contaminated
pharmaceuticals. Pharmacy is responsible for preparation and
storage of most sterile medication. It may be necessary for
pharmacy personnel to participate in identifying patients who
have received specific products associated with epidemics.
Pharmacy personnel are responsible for coordinating recalls of
pharmaceutical preparations, such as occurs in cases of
intrinsic contamination. Other responsibilities of pharmacy
departments may include managing intravenous (IV) therapy
teams, compounding pharmaceuticals for patients receiving
home IV therapy, and compounding enteral nutrition products.
The pharmacy department provides oversight of the safe use
of medications in other areas of the institution (e.g., inspections
for outdated medication and monitoring of refrigerated
medication storage space). The pharmacy also provides information
on pharmaceuticals including indications, dosage, route
of administration, contraindications, adverse effects, drug interactions,
and proper storage. Pharmacy personnel are not at
high risk for occupational exposure to infectious diseases
unless they are involved in direct patient care, such as during
cardiac arrest response. The pharmacy should work
with infection control departments in managing
Introduction I II III IV V VI VII VIII IX X XI XII XIII XIV XV Index
employee exposure to contagious patients and selection
of germicides. Pharmacists may be involved in
advocating and administering immunizations (e.g., influenza
and pneumococcal vaccines). The pharmacy
department should participate in multidisciplinary activities
such as quality assurance teams, infection control
committees, and antimicrobial use programs to ensure
appropriate preparation and use of pharmaceuticals.
II. BASIC PRINCIPLES
Contamination of infusates is an uncommon cause of
infections, but may result in epidemics.1 Intrinsic contamination
(that which occurs during the manufacturing
process) and extrinsic contamination (that which occurs
subsequent to manufacturing, during the admixture
process or while the infusate is in use) of infusates are
a less frequent cause of infection than cannula-related
contamination but are more likely to result in bacteremia
and septic shock.1 Intrinsic and extrinsic contamination
are differentiated based on epidemiologic data.
Most nosocomial epidemics of infusion-related septicemia
resulting from intrinsic or extrinsic contamination
are caused by aerobic gram-negative bacteria.2
Pathogens implicated include the Enterobacteriaceae
such as Klebsiella, Enterobacter, Serratia spp. and
Citrobacter freundii, Burkholderia cepacia and Ralstonia
pickettii.
1-3
Intrinsic contamination of infusate has led to epidemics
of nosocomial sepsis.2,3-5 Intrinsic contamination of
parenteral medications with endotoxin caused an epidemic
of clinical sepsis in a newborn nursery.6 Epidemics
of Candida parapsilosis and Candida albicans
fungemia have been related to use of contaminated parenteral
nutrition (PN).7-9 Epidemics of septicemia
caused by Staphylococcus saprophyticus and Enterobacter
cloacae
have resulted from contamination of
PN admixtures during compounding or storage.10,11
Clusters of postoperative infections have been associated
with extrinsic contamination of propofol, an intravenous
hypnotic agent in a 1% lipid emulsion;
organisms isolated include Staphylococcus aureus,
Candida albicans, Moraxella osloenis, Enterobacter
agglomerans
and Serratia marcescens.12-14 An outbreak
of Serratia marcescens and Enterobacter
cloacae
bacteremia in a surgical intensive care unit was
traced to extrinsic contamination of the parenteral narcotic
fentanyl by a respiratory therapist who was drug
seeking.15
In-use IV fluids have contamination rates of 1.9 to
7.8%.16-19 The most common organism found is coagulase-
negative staphylococci. In addition, free endotoxin was found in 2.5%.18 In-use syringes of propofol have shown contamination rates of 19/376 (5.1%) and 18/302 (5.6%).20,21 Specific microorganisms have the ability to proliferate in different fluids. Klebsiella, Serratia, and Enterobacter species and Burkholderia cepacia can multiply in 5% dextrose.1 Candida albicans can grow slowly,1 while Staphylococcus, Proteus, Escherichia coli, Herellea and Pseudomonas aeruginosa die slowly in dextrose. 22 Burkholderia cepacia, Pseudomonas aeruginosa, Acinetobacter and Serratia will grow in distilled water.1 Pseudomonas aeruginosa, Enterobacter and Serratia can grow in lactated Ringer's solutions. 1 Microbial growth, with the exception of Candida species, is possible in 0.9% sodium chloride.23 Fungi such as C. albicans and Torulopsis glabrata can grow in PN fluids, albeit very slowly; proliferation did not occur when solutions were stored at 4_C for 7 days.24 The growth of most bacteria is inhibited in PN solutions. The addition of albumin to PN solutions increases the potential for bacterial and fungal growth.7,25 Staphylococcus aureus, E. coli, E. cloacae, P. aeruginosa, and C. albicans grow in 10% fat emulsion solution.23,26,27 Staphylococcus epidermidis, C. albicans, and E. coli survive in total nutrient admixtures (TNA), in which fat emulsion is combined with dextrose and amino acid mixtures.28 P. aeruginosa, S. aureus, S. epidermidis, Enterococcus faecalis, and Group JK Corynebacterium displayed greater growth in TNAs as compared to PN fluids.29 Propofol supported the growth of S. aureus, E. faecalis, P. aeruginosa, and C. albicans; for P. aeruginosa and E. faecalis, a bactericidal period was followed, after 48 hours, by increasing growth.30 Preparations of midazolam HCl, morphine sulfate, fentanyl citrate, bupivacaine HCl, atracurium besylate, vecuronium bromide, epinephrine, dopamine, dobutamine, norepinephrine, and sodium nitroprusside in normal saline and 5% dextrose in water were bactericidal for S. aureus, E. faecalis, P. aeruginosa, and E. coli and did not support growth of C. albicans at room temperature over 48–72 hours.30 Contamination of other pharmaceutical products has led to infections. An outbreak of B. cepacia caused by contamination of multidose albuterol vials was linked to poor infection control practices, including respiratory therapists carrying vials in their pockets for several days. The pH of some solutions tested was not within the recommended range, and the concentration of preservative fell from baseline after 5 days.31 Intrinsically contaminated saline solution used for respiratory therapy has caused clusters of R. pickettii respiratory tract colonization.32,33 Use of contaminated multidose ophthalmic containers have resulted in S. marcescens keratitis34 and P. aeruginosa corneoscleritis;35 the organisms were cultured from the container but not from the solution itself.34,35 Bacteria were cultured
Introduction I II III IV V VI VII VIII IX X XI XII XIII XIV XV Index
from 82/638 in-use multidose ophthalmic solutions;36
on the other hand, 81 opened multidose ophthalmic
medications were tested, and no contamination was
found.37 Irrigation with a cardioplegic solution contaminated
with E. cloacae led to an outbreak of sepsis.38
Intrinsic contamination of a non-FDA-approved
product labeled "adrenal cortex extract" caused a
series of cases of Mycobacterium abscessus abscesses
in patients who received intramuscular injections.39
Contamination of enteral nutrition has been associated
with infections, including septicemia.40,41 Many microorganisms,
including gram-negative bacteria, gram-positive
bacteria and fungi, can proliferate in enteral
nutrition preparations.40,42,43 Mineral oil used for
bathing infants was contaminated with Listeria monocytogenes,
leading to an outbreak of neonatal listeriosis.
44
III. MODES OF CONTAMINATION OF
STERILE PHARMACEUTICAL
PRODUCTS
Preparation of IV products in areas outside the pharmacy,
in areas not providing a class 100 environment
(no greater than 100 particles per square foot), has led
to various bloodstream infections. Batch preparation of
propofol syringes outside a laminar-airflow hood was
associated with S. aureus bloodstream infections.45 E.
cloacae
septicemia resulted from preparation of
heparin infusions in an area not specifically designed
for such use.46 An outbreak of B. cepacia sepsis
resulted from preparation of heparin infusions for
several patients using a single 500-mL bag of dextrose,
which was stored near a sink.47
Most IV-related infections result from microbial contamination
of the cannula and the cannula wound.1,2
Improper aseptic technique has been associated with
epidemics. Failure to employ aseptic technique during
preparation and administration of propofol combined
with inherent properties of this product contributed to
extrinsic contamination and resulted in postsurgical
infections.12,13
Several epidemics have been traced to use of contaminated
multidose vials (MDVs), including an outbreak of
fulminant hepatitis B in a hospital that was apparently
due to contaminated heparin flush solution.48 Subcutaneous
Mycobacterium chelonei abscesses resulted
from contamination of diphtheria-pertussis-tetanuspolio
(DPTP) vaccine.49 Contamination of diphtheriapertussis-
tetanus-polio vaccine was implicated in two
outbreaks of group A streptococcal abscesses.50 Septic
arthritis resulted from intra-articular injections of MDV
methylprednisolone contaminated with B. cepacia.51
Contaminated MDVs were the most likely source of outbreaks
of hepatitis C virus infections.52
Contamination of in-use vials is rare, according to
recent studies.53,54 MDVs were tested for bacterial contamination during a two-phase study: during phase I there was a policy in place to discard MDVs after 14 days, and during phase II, they were discarded after 3 months. No contamination was found during either phase.55 An examination of 864 vials in use for up to 402 days found no contamination. The mean duration of use was 18 days, and only 13% were in use for more than 30 days.53 One hundred ninety-seven MDVs were collected that had been entered 1 to 10 times. No bacterial or fungal growth was found.56 Cultures from 8 of 68 insulin vials in use for a mean of 111 days grew Corynebacterium species or S. epidermidis; when recultured, five-eighths did not show growth. None of the positive cultures were associated with infections. No endotoxin was found in any of the samples.57 Sixty-nine in-use MDVs were collected; no bacterial contamination was identified, but one vial was contaminated with red blood cells.54 For the most part, the contents of MDVs, including preservatives, diluent, and the drug itself do not support microbial growth.58-60 Thirteen strains of microbes were used to deliberately contaminate MDVs of insulin, lidocaine, methohexital sodium, potassium chloride, procainamide, sodium thiopental, sodium heparin, and succinylcholine. Procainamide and methohexital were sterile within 24 hours; in lidocaine there was survival and even proliferation of some gram-negative aerobic bacteria. All others killed the organisms slowly or allowed only limited survival. Survival of microbes was not correlated with the presence of preservatives.60 Atropine, lidocaine, and cyanocobalamin were contaminated with S. aureus, P. aeruginosa, E. coli, and S. marcescens. The atropine and lidocaine solutions were sterile within 24 hours at room temperature. S. aureus in cyanocobalamin was killed slowly.58 Undiluted vials of midazolam HCl, morphine sulfate, fentanyl citrate, bupivacaine HCl, atracurium besylate, vecuronium bromide, epinephrine, dopamine, dobutamine, norepinephrine, and sodium nitroprusside were bactericidal for S. aureus, E. faecalis, P. aeruginosa, and E. coli and did not support growth of C. albicans at room temperature over 48–72 hours.29 Single-dose vials of gadolinium-based contrast media were inoculated with S. aureus, S. epidermidis, Corynebacterium jeikeium, Bacillus, Serratia odorifera, Xanthomonas maltophilia, or C. albicans and stored at room temperature or at 4_C. All organisms except S. odorifera persisted at 48 hours; S. aureus, S. epidermidis, and C. jeikeium were still present at 7 days.61 Most experimentally contaminated MDVs of anesthetic agents became sterile within 24 hours.59 Human immunodeficiency virus (HIV) was detectable Introduction I II III IV V VI VII VIII IX X XI XII XIII XIV XV Index up to four hours following deliberate contamination of MDVs of lidocaine containing epinephrine.62 MDVs were deliberately contaminated by several different methods. These methods were: entering the vial
without first swabbing, touching the rubber septum to
the skin, swabbing the rubber septum with an alcohol
wipe that had been dipped into a solution of 107 CFU
of bacteria, leaving the contaminated wipe on the
septum for 20 minutes, contaminating the needle with
the bacterial solution before withdrawing the medication,
and adding 0.1 mL of the bacterial solution to the
vial. With the first three methods, little or no growth
occurred. For the last three methods, almost all vials
showed heavy growth.56 Insulin vials deliberately contaminated
with S. aureus and P. aeruginosa were
sterile by 24 hours at room temperature; P. aeruginosa
was killed more slowly at 4_C.57 Contaminated
vials could be pathogenic even if sterile; following deliberate
contamination with B. (Pseudomonas) cepacia, a
vial of lidocaine had endotoxin, as did a vial of insulin
contaminated with Enterococci.60 Equipment used in
preparing intravenous admixtures can be a source of
contamination.7,8
Methods for Preventing Contamination of
Sterile Products
The Centers for Disease Control and Prevention (CDC)
recommends all parenteral fluids be prepared in the
pharmacy using a laminar-airflow hood.63 The Intravenous
Nursing Society Standards of Practice recommends
that an IV admixing program be established and
conducted under the direction of the pharmacy. When
nurses prepare IV admixtures, they should do so with
the use of a laminar-airflow hood.64
All sterile products should be prepared in a Class 100
environment,65 which can be obtained with the use of
a certified vertical- or horizontal-laminar-airflow hood.
Laminar-airflow hoods should be operated continuously.
Before processing products in the hood, it
should be in operation for a period of time long
enough to purge room air from the work area. All
work should be done at least 6 inches inside the hood.
The work surface and all accessible interior surfaces of
the hood should be disinfected with an appropriate
agent before work begins and periodically thereafter.
Exterior surfaces of the hood should be cleaned periodically.
The American Society of Health-System Pharmacists
(ASHP) recommends that laminar-airflow hoods
be certified biannually or when they are relocated.65
Certification should be performed by a qualified contractor.
66
In order to minimize the risk of contamination, sterile
products should be prepared in an area functionally
separate from other areas. The ASHP Guidelines on
Quality Assurance for Pharmacy-Prepared Sterile

Products65 recommends that the hood be situated in a
"controlled area" that meets either class 100,000 (no
greater than 100,000 particles per square foot) or
10,000 conditions (depending of the risk level of the
products being compounded) for acceptable airborne
particle levels. Class 10,000 conditions (no greater than 10,000 particles per square foot) can usually be met without use of a clean room.67,68 The sterile product preparation area should be one in which airflow and personnel traffic are limited. The ASHP recommends using a "limited access" area, separate from other pharmacy areas. This could be achieved by using a separate room or partitioned area. The materials surrounding the sterile preparation area should be nonparticle shedding. Particle-generating items such as cardboard boxes should not be stored in the area surrounding the hood. Air ducts and vents should not interfere with the airflow in the preparation area. The use of special walls, flooring, and ceilings (clean rooms) is not necessary. However, use of materials such as carpeting, drapes, and other particulate generating material is not acceptable. Personnel preparing sterile products should consider wearing special clothing covers that generate low amounts of particles. The ASHP65 recommends use of protective clothing covers including gowns, masks, and coverings for head and facial hair. However, at least one study has shown that special dress does not affect contamination rates.69 The sterile product preparation area should have handwashing facilities with hot and cold running water. Personnel should clean hands and forearms with an antimicrobial- containing soap or detergent before preparing sterile products. Eating, drinking, and smoking should not be allowed in the preparation area. The containers of the ingredients used for compounding the sterile product should be inspected for defects, expiration date, and product integrity before use. If the product is defective or has expired, it should not be used. Defective products should be promptly reported to the FDA.70 The rubber stoppers of containers should be wiped or sprayed with 70% alcohol before entry. The ASHP recommends that the entire surface of ampuls, vials, and container closures be disinfected appropriately before placement in the laminar-airflow hood.65 Automated devices used for compounding sterile products that are placed in the laminar-airflow hood should first be disinfected. Personnel should avoid touch contamination of sterile supplies. In 2002, five cases of Exophiala dermatitidis infection associated with injectable methylprednisolone acetate were reported to the CDC. The methylprednisolone had been prepared at a compounding pharmacy later found to have improper performance of an autoclave with no written procedures for autoclave prepara- Introduction I II III IV V VI VII VIII IX X XI XII XIII XIV XV Index tion, no testing for sterility or appropriate checking of quality indicators, and inadequate clean room practices as outlined in the ASHP guidelines for pharmacy-prepared products. Four patients developed meningitis after epidural injections, resulting in one death, and one patient developed sacroiliitis after intra-articular injections. Cases occurred as late as 152 days following an injection.71 Several factors must be considered in assessing the sterility of MDVs.72,73 The aseptic technique of individuals likely to enter specific vials is an important factor in determining sterility; improper aseptic technique has been identified in healthcare workers.74,75 The environment in which the vial will be entered is also important, such as sterility of the environment where vials are entered (i.e., laminar-airflow hoods versus patient care units) and situations under which vials are opened (e.g., MDVs on cardiac arrest carts are often entered without careful attention to aseptic technique and should be discarded after the first use).73,76 The U.S. Pharmacopoeia (USP) procedure for testing effectiveness of preservatives in MDVs does not require killing of all microorganisms but rather inhibition of proliferation of the microorganisms.76 The concentration of preservatives cannot be increased to unsafe levels.50 Many drug preparations appear to have sterilizing properties irrespective of the presence of preservatives.5 The effects of refrigeration on the bactericidal activity of preservative in MDV should be considered in setting policy.58 Solutions containing preservatives (phenol, methylparaben, and benzyl) and inoculated with S. aureus, P. aeruginosa, E. coli, and S. marcescens show persistence of bacteria longer under refrigeration than at room temperature.58,64 The number of entries may affect sterility of MDVs; however, there is no practical way to document this. In addition, frequent use may cause vials to be used up more rapidly, thereby actually reducing the risk of infection.53 Setting time limits after first opening can help ensure sterility and stability: 1. Manufacturers' expiration dates apply to stability and sterility of unopened vials. 2. There are no specific guidelines with respect to expiration of opened MDVs.63,73 The USP considers "any time limit put on the use of a multipledose vial after its first opening as strictly arbitrary." 73 3. Discarding MDVs after one use is probably not necessary. 4. Some sources recommend dating all opened vials, although there is no evidence that dating vials has any effect on sterility.53,54 5. Expiration of vials may need to vary according to other factors that affect sterility. The CDC recommends use of single-dose vials whenever possible for admixture of parenteral products.63 However, this may not be practical for IV admixture programs for reasons of economy and efficiency. When MDVs are used, the CDC recommends refrigerating the vials after opening if recommended by the manufacturer, cleaning the rubber diaphragm of the vial with alcohol before inserting a device into the vial, using a sterile device each time a vial is accessed, and avoiding touch contamination of the device before penetrating the rubber diaphragm. The MDV should be discarded when empty, when suspected or visible contamination occurs, or when the manufacturer's stated expiration date is reached.63 The final sterile product should be examined for any leaks, cracks, turbidity, or particulate matter. Bacterial growth may not be obvious, even in concentrations of 106/mL.22,63 The ASHP65 recommends a label be attached to all admixed parenterals and include the following information: 1. For patient-specific products: the patient's name and any other appropriate patient identification (e.g., location, identification number); for batch-prepared products: control or lot number 2. All solution and ingredient names, amounts, strengths, and concentrations (when applicable) 3. Expiration date and time, when applicable 4. Prescribed administration regimen, when appropriate (including rate and route of administration) 5. Appropriate auxiliary labeling (including precautions) 6. Storage requirements 7. Identification of the responsible pharmacist (and technician) 8. Device-specific instructions (when appropriate) 9. Any additional information, in accordance with state or federal requirements Storage of pharmaceuticals that are to be used to admix parenterals should be according to manufacturers' recommendations. Admixed parenterals may be stored in the refrigerator for up to 1 week, providing that refrigeration begins immediately after preparation and is continuous. Stability of ingredients may dictate a shorter storage time. The ASHP indicates that, depending on the sterile product preparation procedures used and the storage temperature, the admixed parenteral products may be stored for longer periods of time.6 Introduction I II III IV V VI VII VIII IX X XI XII XIII XIV XV Index The CDC has not made recommendations for the hang time of IV fluids (including nonlipid-containing parenteral nutrition fluids). Lipid-containing PN fluids should be completed within 24 hours of hanging the fluid.63 The CDC recommends that infusion times for lipid emulsions not part of a total nutrient admixture should be no more than 12 hours.63 However, some manufacturers of lipid emulsions support a 24-hour hang time.77 The manufacturers of propofol recommend that the drug be stored at room temperature; refrigeration is not recommended. If the drug is used directly from the prefilled syringe or vial, it should be used within 12 hours. Tubing and any unused portions of propofol vials should be discarded after 12 hours. However, if propofol is transferred to a syringe or other container prior to administration, the drug should be discarded and administration lines changed after 6 hours. Strict aseptic technique must be maintained in handling even though a preservative (EDTA or sodium metabisulfite) has been added.78 The pharmacy should monitor for appropriate storage of pharmaceuticals throughout the institution. Routine
inspections should be performed to ensure that expired
medications are removed from patient care areas and
disposed of properly. Temperatures of refrigerators
and freezers used to store pharmaceuticals should be
closely monitored and recorded daily.
For preparations given a high risk level, the ASHP65
recommends establishing criteria for monitoring the
environment, including air quality and work surfaces.
The ASHP65 recommends sterilization and quarantine
for high-risk products; efficacy of the sterilization
process should be validated. The ASHP recommends
that quality assurance procedures be developed to validate
aseptic technique for each person preparing
sterile products. Revalidation should occur annually or
"whenever the quality assurance program yields an
unacceptable result, and whenever unacceptable techniques
are observed."65
Pharmacy Responsibilities involving
Antimicrobial Control
Concerns about resistance causing increased morbidity,
mortality, and costs of healthcare have led to recommendations
to control antimicrobial use.79,80 Multidisciplinary
groups, including pharmacists, should establish
a system for monitoring resistance and antibiotic
usage, establish practice guidelines and other policies
to control the use of antibiotics and respond to data
from the monitoring system, and measure outcomes to
evaluate the effectiveness of policies. Microbiologists
should work with infectious disease clinicians, pharmacists,
hospital epidemiologists, infection control profes-
sionals, and representatives of clinical departments to
choose the drugs that will be tested and routinely
reported. Specific responsibilities for pharmacy personnel
include generation and analysis of data to determine
compliance with restriction policies, participation
in development of programs for formulary and antimicrobial
controls, responsibility for computer medication
order entry systems, and in collaboration with physicians,
patient-specific recommendations for optimal
antimicrobial use.
IV. SUMMARY AND CONCLUSIONS
Pharmacy is responsible for preparation and storage of
most sterile medication. The pharmacy department
should participate in multidisciplinary activities such as
quality assurance teams, infection control committees,
and antimicrobial use programs to ensure appropriate
preparation and use of pharmaceuticals and sterile
products.
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Source: http://hica.jp/forum/yuekichosei/61Pharmacy.pdf

infoguerre.fr

Pourquoi les effets de secondaires de l'antidiabétique orale Avandia (roziglitazone) de sont-ils passés inaperçus en Executive summary In a context where the French pharmaceutical industry is buffeted by scandals and molecules in the hot seat. We would like to return to the information processing of the Avandia®

Pp150722 1263.1273

The Stromal Chloroplast Deg7 Protease Participates inthe Repair of Photosystem II after Photoinhibitionin Arabidopsis1[W][OA] Xuwu Sun, Tingjiao Fu, Ning Chen, Jinkui Guo, Jinfang Ma, Meijuan Zou, Congming Lu, and Lixin Zhang* Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy ofSciences, Beijing 100093, China Light is the ultimate source of energy for photosynthesis; however, excessive light leads to photooxidative damage and hencereduced photosynthetic efficiency, especially when combined with other abiotic stresses. Although the photosystem II (PSII)reaction center D1 protein is the primary target of photooxidative damage, other PSII core proteins are also damaged anddegraded. However, it is still largely unknown whether degradation of D1 and other PSII proteins involves previouslyuncharacterized proteases. Here, we show that Deg7 is peripherally associated with the stromal side of the thylakoidmembranes and that Deg7 interacts directly with PSII. Our results show that Deg7 is involved in the primary cleavage ofphotodamaged D1, D2, CP47, and CP43 and that this activity is essential for its function in PSII repair. The double mutants deg5deg7 and deg8 deg7 showed no obvious phenotypic differences under normal growth conditions, but additive effects wereobserved under high light. These results suggest that Deg proteases on both the stromal and luminal sides of the thylakoidmembranes are important for the efficient PSII repair in Arabidopsis (Arabidopsis thaliana).