The novel coronavirus does not appear to wax and wane with the passing of the seasons, experts at the World Health Organization said Monday. “In the absence of control measures, very often, viruses can show seasonal patterns. We’ve certainly seen that with influenza. This virus has demonstrated no seasonal pattern as such, so far,” said Mike Ryan, who heads the WHO’s emergencies program.

“What it has clearly demonstrated is, you take the pressure off the virus, the virus bounces back.”

Some had hoped that heat and humidity would stifle transmission of the coronavirus. From the earliest days of the outbreak during the winter months, President Trump claimed the pandemic would end in warmer weather.

But studies – and the ebb and flow of the virus in the United States itself – have shown that is not the case. Coronavirus cases rose quickly in cities such as Houston, Austin, Dallas and Phoenix in the summer months, even as the mercury rose into the triple digits. The two countries hit hardest by the virus outside North America – Brazil and India – are both hot weather climates. In Russia, where the climate is much cooler, more than 890,000 people have tested positive for the virus.