Expanded Access Intermediate Size Treatment Protocol: Pritelivir for Immunocompromised Subjects With Treatment Resistant Herpes Simplex Virus Type 1 or 2

Inclusion Criteria: Immunocompromised (due to conditions including HIV infection, hematopoietic-cell or solid organ transplantation, and chronic glucocorticoid use) men and women of any ethnic group aged ≥16 years. ACV-resistant and foscarnet-resistant/intolerant mucocutaneous HSV infection based on clinical failure (no improvement after oral or iv doses for at least 7 days at doses equivalent to or greater than oral doses of 800 mg TID ACV or 1 g TID valacyclovir and/or foscarnet therapy or intolerance to foscarnet requiring cessation of foscarnet treatment) or result from genotypic/phenotypic testing. Patients previously treated in PRIOH-1 or the EAP with proven ACV-R mucocutaneous lesions and foscarnet resistance or intolerance, which have a recurrence in the location of previous HSV outbreaks, do not need a new genotypic/phenotypic analysis of HSV or clinical proof of ACV-R or foscarnet resistance/intolerance. Manifestations of foscarnet intolerance may include: renal function impairment, seizures, genital irritation and/or ulcerations, extremity paraesthesia, nausea, granulocytopenia, anemia, leukopenia, thrombocytopenia, hypokalemia, hypocalcemia, hypomagnesemia, diabetes insipidus, injection site reactions, psychotic disorders, including but not limited to anxiety and aggression. The current lesion(s) should be confirmed to be positive for HSV before the start of treatment. If not tested beforehand, a lesion swab should be taken for PCR or cell culture before starting treatment, but treatment may be started before obtaining results. Patients previously treated in PRIOH-1 or the EAP with proven ACV-R mucocutaneous lesions and foscarnet resistance or intolerance, which have a recurrence in the location of previous HSV outbreaks, do not need a new genotypic/phenotypic analysis of HSV or clinical proof of ACV-R or foscarnet resistance/intolerance. Visual confirmation of lesion at start of treatment (including by endoscopy and pharyngoscopy). Willingness to abstain from the application of lotions and/or creams to the area with HSV lesions. Wet/dry saline dressings or bandages at lesion site are allowed. Willing to use highly effective method of contraception: Male subjects must be surgically sterile (e.g., vasectomy at least for the last 26 weeks) or must agree to use an adequate method of contraception (see definition below) during sexual intercourse with women of childbearing potential to make sure the fathering of a child will be ruled out during treatment and for at least 6 complete months after the final dose of pritelivir. Female subjects of non-childbearing potential must be either surgically sterile (hysterectomy, bilateral tubal ligation, salpingectomy, and/or bilateral oophorectomy at least 26 weeks before starting treatment) or post-menopausal (defined as spontaneous amenorrhea for at least 2 years, with follicle-stimulating hormone (FSH) in the postmenopausal range at start of treatment based on the laboratory's ranges). Female subjects of childbearing potential must use an adequate method of contraception (see definition below). An adequate method of contraception is defined as a highly effective method of contraception plus use of a condom during participation in this compassionate use program and for at least 6.5 complete months after the final dose of pritelivir. A highly effective method of contraception is defined as: copper intrauterine device the levonorgestrel-releasing intrauterine system the progestogen implant combined (estrogen and progestogen containing) hormonal contraception (oral, intravaginal, transdermal) associated with inhibition of ovulation progestogen-only hormonal contraception (oral, injectable, implantable) associated with inhibition of ovulation. Negative pregnancy test for females of childbearing potential at Day 1 and every 4 weeks thereafter. Patient must be willing and able (in the opinion of the physician) to understand the informed consent form. Patient must give written informed consent. Exclusion Criteria: Eligibility and feasibility for a patient to participate in a currently ongoing clinical trial with pritelivir. Known intolerance to pritelivir or any of the excipients (microcrystalline cellulose, croscarmellose sodium, mannitol, colloidal anhydrous silica, magnesium stearate, hydroxy propyl methyl cellulose, polyethylene glycol, calcium diphosphate). Need to use the following medications at any dose: paclitaxel, esomeprazole, rabeprazole. Need to use the medications with the following daily dose levels: omeprazole > 20 mg/d, lansoprazole > 20 mg/d or pantoprazole > 80 mg/d. Baseline safety laboratory abnormalities: ANC < 1000 cells/mm3 Platelet count < 25,000 cells/mm3 Hemoglobin < 8.0 g/dL AST or ALT > 5 x ULN Bilirubin > 2.5 x ULN History or current evidence of gastrointestinal malabsorption which, in the opinion of the physician, may affect the extent of absorption of pritelivir. Severe renal insufficiency (eGFR ≤ 29 using the CKD-EPI Creatinine Equation (2009) to estimate GFR). History or current evidence of significant cardiovascular, pulmonary, hepatic, renal, gastrointestinal, hematological, endocrinological, metabolic, neurological, psychiatric, or other diseases, which, in the opinion of the physician, may affect the patient's safety. Abnormalities in hematological, clinical chemical or any other laboratory variables regarded as clinically relevant by the physician unless they are due to underlying disease or condition. Not able to communicate meaningfully with the physician and site staff. Any other condition which in the opinion of the physician would interfere with successful completion of the treatment. Pregnant and/or breastfeeding women. HSV-viremia HSV-encephalitis, meningitis, meningoencephalitis, myelitis, radiculopathy.