With a mean serial interval of 7.5 days (95% CI, 5.3 to 19), the basic reproductive number was estimated to be 2.2 (95% CI, 1.4 to 3.9). In its early stages, the epidemic doubled in size every 7.4 days. The mean incubation period was 5.2 days (95% confidence interval, 4.1 to 7.0), with the 95th percentile of the distribution at 12.5 days. The majority of cases (55%) with onset before January 1, 2020, were linked to the Huanan Seafood Wholesale Market, as compared with 8.6% of the subsequent cases. The Chinese team conducting the study said their findings support a 14-day medical observation period for people exposed to the pathogen.īelow is an extract of the study findings (highlight added by Worldometer):Īmong the first 425 patients with confirmed NCIP, the median age was 59 years and 56% were male. 30, has found the incubation period to be 5.2 days on average, but it varies greatly among patients. 22 Incubation period of 5.2 days on averageĪ Chinese study published in the New England Journal of Medicine on Jan. , and another case with an incubation period of 27 days was reported by Hubei Province on Feb. More recently, however, a case with an incubation period of 19 days was observed in a JAMA study published on Feb. WHO is not considering changing recommendations regarding incubation periods.24 days represented an outlier observation that must be taken into consideration in the context of the main finding of the study.a very long incubation period could reflect a double exposure. The WHO said in a press conference on February 10 that: The incubation period has been found to be as long as 24 days (range: 0-24 days median: 3.0 days) in a study published on February 9. The estimated range will be most likely narrowed down as more data becomes available.
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