Trevor Bedford, Discover and Read the Best of Twitter Threads by @trvrb

The drivers of the #COVID19 epidemic in India are certainly multifactorial, but we have now seen the viral lineage B.1.617 linked to this epidemic continue to increase in frequency in

From Aug 2020 to Mar 2021, the lagged case fatality rate (CFR) of the US #COVID19 epidemic had remained largely constant at ~1.5% and provided a simple method to predict

There are effectively two #COVID19 epidemics in the US at this moment; one largely resolving epidemic comprised of non-variant viruses and one growing epidemic of B.1.1.7. Together they have resulted

It's hard for me to infer the degree to which new variants are driving the surge in cases in India, but we are seeing rapid growth in frequency of multiple

When variants of concern were first identified in late Dec, the US was not where it needed to be in terms of genomic surveillance. However, with considerable ramp up by

Daily #COVID19 case counts are increasing in the US and we seem to hitting a third wave (or second surge if you'd prefer). Here I wanted to look at how

I wanted to discuss the degree to which population immunity may be contributing to curbing #COVID19 in Florida, Arizona and Texas, where recent surges have resulted in substantial epidemics. 1/16

It's abundantly clear that societal behavior strongly impacts #COVID19 spread. We saw this early on where social distancing resulted in significant reductions to epidemic spread. With the surge of cases

As many have noted, there has been an uptick in confirmed #COVID19 cases in multiple states starting roughly at the beginning of June. There is a major question surrounding how

On Feb 29, using the genetic sequence of the first community case of #COVID19 in Washington State, I made the claim that the Washington State outbreak descended directly from the

A resident of rural Snohomish County, "Jean" had COVID-like symptoms in late Dec 2019 and has subsequently tested positive in a serological assay. This may have been COVID-19 infection, but

We now have enough #SARSCoV2 genomic data from different states to make some broad conclusions about how the #COVID19 epidemic has unfolded in the US. 1/14 We see a spectrum