Alastrim and Variola major

Alastrim noun - A mild form of smallpox caused by a less virulent form of the virus.

Variola major and alastrim are semantically related. In some cases you can use "Variola major" instead a noun "Alastrim".

Variola major noun - A highly contagious viral disease characterized by fever and weakness and skin eruption with pustules that form scabs that slough off leaving scars.

Alastrim and variola major are semantically related. Sometimes you can replace term "Alastrim" with "Variola major", this terms are similar.