@theconversation.com 2 years ago With a COVID 'variant soup' looming, New Zealand urgently needs another round of vaccine boosters
@BBCWorld 5 years ago Immunity differs, from virus to virus The MMR vaccine should give life-long immunity to measles The new coronavirus - called Sars-CoV-2 - hasn’t been around long enough to know how long immunity lasts bbc.in t.co
@reuters.com 5 years ago Explainer: How an old tuberculosis vaccine might help fight the new coronavirus