There are many viral diseases without vaccines. Plus viruses mutate sort of how SARS mutated into COVID. A cursory google search shows these 10 diseases as not having vaccines:
- Chagas disease (American trypanosomiasis)
- Chikungunya
- Dengue
- Cytomegalovirus
- HIV/AIDS
- Hookworm infection
- Leishmaniasis
- Malaria
- Respiratory Syncytial Virus
- Schistosomiasis
Hookworm is also not a virus. Its what the name says, a worm.
HIV has a treatment called protease inhibitors.
All the other diseases you mentioned arent likely to turn into a pandemic







