Incidence of SARS-CoV-2 infection in close contacs. Telephone follow-up in Primary Care

Objective: To study the incidence of infection in close contacts with patiens with SARS-CoV-2 infection using a telephone monitoring protocol after the recommendation of isolation and quarantine at home.

Patients and methods: Cohort study, with 124 patients older than 15 years, included consecutively, asymptomatic at the time of the consultation, who had had close contact (<2 meters) with confirmed or possible cases of SARS-CoV-2 infection. The intervention consisted of 2 weeks of home isolation and quarantine, contacting by phone on days, 2, 4, 7 and 14 after the contact. The event of interest was the appereance of symptoms compatible with SARS-CoV-2 infection.

Results: The average age was 45.1 years (55.6% women); 328 phone calls were made (average 2.6 calls for patient). After 2 weeks of follow-up, 6 patients developed symptoms, confirming serologically or by PCR in 3 of them (2.4%, CI 95%: 0.8-6.9).

Conclusions: The incidence of SARS-CoV-2 infection in close contacts is low 2 weeks after home isolation and quarantine at home.