This conspiracy theory should be easy to debunk: it is biologically impossible for viruses to spread using the electromagnetic spectrum. The latter are waves/photons, while the former are biological particles composed of proteins and nucleic acids. But that isn’t really the point — conspiracy theories are enticing because they often link two things which at first might appear be correlated; in this case, the rapid rollout of 5G networks was taking place at the same time the pandemic hit. Cue a viral meme linking the two, avidly promoted by anti-vaccine activists who have long been spreading fears about electromagnetic radiation, egged on by the Kremlin.
It’s worth repeating, as the World Health Organization (WHO) points out, that viruses cannot travel on mobile networks, and that COVID-19 is spreading rapidly in many countries that do not have 5G networks. Even so, this conspiracy theory — after being spread by celebrities with big social media followings — has led to cellphone towers being set on fire in the UK and elsewhere.