1/n New #covid19 contact tracing study from Taiwan. Key findings:
A. Overall secondary attack rate was 18 of 2761, or 0.7%. Family contacts (household and non-household) clearly at increased risk.
jamanetwork.com/journals/jamai…
A. Overall secondary attack rate was 18 of 2761, or 0.7%. Family contacts (household and non-household) clearly at increased risk.
jamanetwork.com/journals/jamai…
2/n:
B: No transmissions occurred in people who had contact with index case after day 6 following symptom onset.
B: No transmissions occurred in people who had contact with index case after day 6 following symptom onset.
3/n:
C: Transmission risk was higher when index case was severely ill. No transmissions occurred in asymptomatic cases.
C: Transmission risk was higher when index case was severely ill. No transmissions occurred in asymptomatic cases.
4/n:
D: Transmission risk seems similarly high in contacts who only had presymptomatic exposure to index patient (CAVEAT: not statistically significant)
D: Transmission risk seems similarly high in contacts who only had presymptomatic exposure to index patient (CAVEAT: not statistically significant)
5/n:
E: Most patients are probably not infectious anymore when they need hospitalisation.
E: Most patients are probably not infectious anymore when they need hospitalisation.
6/n:
F: To increase ROI of contact tracing, it could make sense to focus on the days around symptom onset.
F: To increase ROI of contact tracing, it could make sense to focus on the days around symptom onset.
7/7:
G: The number of health care contacts that led to nosocomial infection was low. Makes sense when most cases were not infectious anymore when hospitalised.
G: The number of health care contacts that led to nosocomial infection was low. Makes sense when most cases were not infectious anymore when hospitalised.
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