заразность SARS-CoV-2

заразность SARS-CoV-2


SARS-CoV-2 Infection among Travelers Returning from Wuhan, China

We followed up on 94 persons who boarded an evacuation flight from Wuhan
to Singapore on January 30, 2020. Screening for body temperature was
conducted at check-in and before boarding, and 3 febrile persons were
prevented from boarding (Figure 1);

On arrival in Singapore, the passengers underwent repeat screening for
body temperature (fever was defined as a body temperature ≥38°C), and 2
persons (a woman 48 years of age [Patient 1] and a woman 47 years of age
[Patient 2]) had a fever. The 2 febrile women were transferred
immediately to a hospital, and they tested positive for SARS-CoV-2

The remaining 92 afebrile passengers (age range, 2 to 82 years) were
quarantined for 14 days at a government quarantine facility, where they
were checked for symptoms and fever three times daily. Six persons
reported symptoms (4 on quarantine day 2 and 2 on quarantine day 3) and
were placed in isolation in a hospital and underwent
polymerase-chain-reaction (PCR) testing; all 6 persons tested negative
for SARS-CoV-2. On quarantine day 3, samples from 76 of the 86
asymptomatic persons (75 nasopharyngeal swab samples and 1 nasal swab
sample) were obtained and tested by means of PCR assay. A 17-year-old
boy (the son of Patient 1) tested positive for Covid-19 and continued to
have PCR-positive status for 2 weeks, and a 41-year-old man had an
inconclusive result (positive for N gene and negative for ORF1ab gene).
On quarantine day 6, samples from all 87 quarantined asymptomatic
persons (85 nasopharyngeal swab samples and 2 nasal swab samples [3 of
the 6 persons who had been transferred to the hospital before February 2
had returned to the government quarantine facility]) were obtained and
tested; all tested negative. All persons who were not isolated in the
hospital were released from quarantine on day 14, and all remained
uninfected with Covid-19.