No they don't. Exceptions like Dengue exist where subsequent infections by the 4 serotypes of the virus are more lethal than the initial one because the second infection causes Dengue Shock Syndrome instead of Dengue Haemorrhagic Fever. You don't get immunity, you get dead.
If it has 4 different types? Then catching 1 would make you immune to that 1, you'd catch the other 3 for the second infection.
Once a virus mutates enough you're no longer immune, but any vaccine is also negated too, that's how it works. Same for 4 different virus strains I suppose: if they are genetically different enough you could catch all 4, in theory.
Different types of Dengue were among the viruses stolen from the Winnipeg L-4 Lab and sent to Wuhan...
No they don't. Exceptions like Dengue exist where subsequent infections by the 4 serotypes of the virus are more lethal than the initial one because the second infection causes Dengue Shock Syndrome instead of Dengue Haemorrhagic Fever. You don't get immunity, you get dead.
If it has 4 different types? Then catching 1 would make you immune to that 1, you'd catch the other 3 for the second infection.
Once a virus mutates enough you're no longer immune, but any vaccine is also negated too, that's how it works. Same for 4 different virus strains I suppose: if they are genetically different enough you could catch all 4, in theory.
Different types of Dengue were among the viruses stolen from the Winnipeg L-4 Lab and sent to Wuhan...