a decreasing trendp < 0.001
The genetic distance showed a decreasing trend over time (Pearson correlation coefficient r = – 0.509, p < 0.001), suggesting that the sequence diversity of early virus was higher.
The genetic distance showed a decreasing trend over time (Pearson correlation coefficient r = – 0.509, p < 0.001), suggesting that the sequence diversity of early virus was higher.
By measuring the length of amino acid sequences, it was observed that the amino acid sequence at each time point of V2 and V3 remained stable, whereas the amino acid sequence at each time point of the V4 and V5 regions showed an increasing trend over time, compared with the 201603 time point (p < 0.01).