GENEVA (AP) – Chinese officials say they did not detect any “unusual or novel diseases” in the country, the World Health Organization said Thursday, following an official request by the U.N. health agency for information about a potentially worrying spike in respiratory illnesses and clusters of pneumonia in children.
A reasonable explanation is in this thread: https://twitter.com/BlakeMMurdoch/status/1728160700965523736
Basically, COVID causes a similar immune deficiency to that of HIV. This deficiency weakens the body’s response to other illnesses, making infections like RSV or pneumonia more severe or more frequent. We see this effect more commonly in children because children have a lower vaccination rate than adults.