It burst onto the global scene in late 2019?
The reverse is true due to a number of factors.
According to an Australian professor of biostatistics and epidemiology, the competition for the title of most infectious disease known to man is between BA.4 and BA.5.
The original strain of COVID-19 had a reproductive rate of 3.3, meaning that 3.3 people were affected by it. COVID-19 was one of the least transmissible human disease.
The 1918 Pandemic strain of flu had an estimated R0 of 2 and was less transmissible than the other strains. Measles has an R0 of 18 and is the top disease on the higher end of the spectrum.
The COVID variant has become more transmissible with time. The reproductive rate for Delta was 5.1. Omicron's reproductive rate was almost double that of Omicron.
Adrian Esterman, a professor at the University of South Australia, wrote on The Conversation that "stealth Omicron" was more transmissible than BA.1, so its reproductive rate was around 13
There are new studies suggesting that BA.4 and BA.5 have a growth advantage over BA. 2. According to Esterman, the latest dominant COVID subvariants have a reproductive rate of over 18.
They all should be surpassed by the next dominant COVID strain. The World Health Organization said it was following the ultra-new Omicron subvariant "Centaurus", which made headlines this week. It's already on the heels of dominant BA.5 in India, with "apparent rapid growth and wide geographical spread," according to Tom Peacock.
It's reproductive rate is not known.
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