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...
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...