Monkeypox
Conditions
Keywords
Monkeypox vaccine, Immune responses, HIV
Brief summary
This observational study has been designed to characterize humoral and cellular immune responses after vaccination against monkeypox (MKP) in HIV positive and negative individuals at high risk of MKP infection during the vaccination campaign in the current monkeypox outbreak.
Detailed description
Of the 23,837 cases of monkeypox reported in the European Region of the WHO, 7.037 have been identified in Spain, according to the National Epidemiological Surveillance Network (RENAVE). Most of diagnosed individuals are men born in Spain, being nearly 40% HIV positive. The clinical evolution was satisfactory, although 3-7% of cases required hospitalization. Given the limited number of available doses of the MVA-BN vaccine, it has been recently approved its use as a single intradermal dose. However, this posology can be more reactogenic than subcutaneous injection and there is limited data on its immunogenicity and effectiveness in people living with HIV (PLWH), which account for about half of the monkeypox cases in the current outbreak. The present observational study has been designed to investigate the humoral and cellular immune responses following monkeypox vaccination in PLWH.
Interventions
None listed
Sponsors
Fundación FLS de Lucha Contra el Sida, las Enfermedades Infecciosas y la Promoción de la Salud y la Ciencia
IrsiCaixa
BCN Checkpoint
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Inclusion criteria
1. Adult individuals of ≥18 years old. 2. Willing to comply with the requirements of the protocol and available for follow-up for the planned duration of the trial. 3. Has understood the information provided and capable of giving informed consent.
Exclusion criteria
1\. Participant has any medical condition and/or finding that in the investigator opinion might increase participant risks, interfere with the study or impair interpretation of study data.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Proportion of participants with detectable anti-orthopox antibodies | Between day 29 - 90 | Proportion of participants with detectable anti-orthopox antibodies at 29 - 90 days following first MVA-BN vaccination |
| Quantification of anti-orthopox antibodies | Between day 29 - 90 | Quantification of anti-orthopox antibodies at 29 - 90 days following first MVA-BN vaccination |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Changes of the immunogenicity after the first vaccine dose | Between day 29 - 90 and between 150-180 (after the first dose) and between 29 - 90 and between 150-180 (after the second dose if applicable) | The geometric mean fold rise (GMFR) in anti-orthopox antibody titers from baseline to Day 29-90 and 150-180 after the first dose of MVA-BN and to 29-90 and 150-180 after the second dose (if applicable) |
| To compare immunogenicity between HIV negative and HIV positive individuals | Between day 29 - 90 and between 150-180 (after the first dose) and between 29 - 90 and between 150-180 (after the second dose if applicable) | To compare the GMFR between HIV negative and HIV positive individuals |
| Neutralization capacity of anti-orthopox antibodies | Between day 29 - 90 and between 150-180 (after the first dose) and between 29 - 90 and between 150-180 (after the second dose if applicable) | Neutralization titers measured as the reciprocal dilution inhibiting 50% of the infection (ID50) will be reported using a live virus assay (VNA) to measure cytopathic effect in Vero E6 cells after the first dose of MVA-BN. |
| To compare neutralization capacity between HIV negative and HIV positive individuals | Between day 29 - 90 and between 150-180 (after the first dose) and between 29 - 90 and between 150-180 (after the second dose if applicable) | To compare ID50 between HIV negative and HIV positive individuals |
Countries
Spain
Contacts
CONTACTBeatriz Mothe, PhD, MD
CONTACTSusana Benet, PhD, MD
Outcome results
None listed