Level of Immunity, Neutralization of the COVID-19 Virus and Reinfections in Residents of 2 Migrant Workers' Residences

Epicentre

Status: Withdrawn

Conditions: SARS-COV-2

Treatments: Biological: Blood and Saliva collection

Study type: Observational

Funder types: Other; Industry

Identifiers

NCT04932837

811562

Details and patient eligibility

About

A previous seroprevalence survey showed very high seroprevalence levels among residents of the two among the residents of the two migrant workers' hostels surveyed, indicating a high level of circulation of the virus SARS-COV-2 during the 1st wave of COVID-19. The constitution of a cohort after the event would be an opportunity to obtain opportunity to obtain answers to crucial questions: duration of immunity, potential reinfections potential reinfections, potential re-clustering. Going back to check the serological status seems feasible, especiallyespecially in the Foyers de Travailleurs Migrants (high probability of finding the participants).

There is an obvious scientific interest around the duration of immunity and reinfections in a population highly exposed during the first wave. Several articles document the decline of IgG antibodies in the months following an infection, but very few infection, but very few evaluate the protective character in the medium term (>=6 months), especially in asymptomatic individuals. We are also concerned about the circulation of We are also concerned about the circulation of new variants and the immunity acquired after infection in residents.

To date, no study on the duration of immunity has been conducted in migrant worker's residences.

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• All individuals who consented to participate in the 1st study and who consent to participate in this study
• All individuals 18 years of age or older not residing in the 2 MWRs in July 2020 and permanently living in the MWR since September 2020 who consent to participate in this study

Exclusion criteria

• Unwillingness to provide informed consent
• Unwillingness to provide blood
• Contraindication to venepuncture

Trial design

0 participants in 1 patient group

migrant worker residents

Description:

The target population will be the 124 residents in the 2 migrant worker residences who were included in the previous seroprevalence study and those who arrived at the 2 residences since September 1st, 2020

Treatment:

Biological: Blood and Saliva collection