re: 'Worst version of COVID' will be dominant in U.S. by July

The article in the OP refers to the “worst” simply in terms of evading previous antibodies

Even liberal sites, have this to say about the 4 and 5 Omicron strains

quote:

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The BA.4 and BA.5 subvariants are spiking globally because they can spread faster than other circulating variants — mostly BA.2, which caused a surge in cases at the beginning of the year. But so far, the latest Omicron variants seem to be causing fewer deaths and hospitalizations than their older cousins — a sign that growing population immunity is tempering the immediate consequences of COVID-19 surges.

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