Fri Jan 24 23:21:10 2020
<d3f496ca> <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2887442/|https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2887442/>
— The Re-Emergence of H1N1 Influenza Virus in 1977: A Cautionary Tale for Estimating Divergence Times Using Biologically Unrealistic Sampling Dates
— In 1977, H1N1 influenza A virus reappeared after a 20-year absence. Genetic analysis indicated that this strain was missing decades of nucleotide sequence evolution, suggesting an accidental release of a frozen laboratory strain into the general population. …
