Russian scientists do not exclude the man-made origin of smallpox

In an interview with the radio station "Moscow speaking" the head
of the department of the Research Institute of Epidemiology and
Microbiology Gamalei, Alexander Butenko made a statement
(https://yhoo.it/3MYE3gn):
There is a very dangerous phenomenon here, and how did it happen?
It is possible that, perhaps, some people are maniacally inclined,
who, perhaps, missed the coronavirus pandemic, decided to
demonstrate something like that intentionally or by accident. Such
a leak from laboratories is known. About 15 years ago, probably,
there were cases of leakage of anthrax from American laboratories,
and then some smart people sent it by mail in the form of letters to
their addressees, and they became infected at autopsy. It was in the
form of a powder, and an aerosol was immediately created.