evidence: A: Vaccines against other diseases do not offer protection against SARS-CoV-2. This is a new virus that will need its own vaccine, and researchers are working on developing a safe and effective one. A: SARS-CoV-2 can be transmitted in all areas, including hot/humid and cold climates. A: While gargling with warm saltwater can make a sore throat feel better, it has no effect on SARS-CoV-2.