Now playing Next Health 'Nocebo effect' cause of most COVID vaccine side effects, study says 19/01/2022
Now playing Next Health Get ready for yearly COVID-flu combo vaccines, say Moderna and Pfizer 18/01/2022
Now playing Next Health COVID vaccines are not enough for Omicron variant, warns BioNTech CEO 20/12/2021
Now playing Next Health Here’s what COVID vaccine makers are doing about the Omicron variant 08/12/2021
Now playing Next Health Pfizer to allow developing countries to make and sell its COVID pill 16/11/2021
Now playing Next Health Pfizer’s says its COVID pill is highly effective in high risk cases 05/11/2021
Now playing Next Health Pfizer's COVID vaccine can now be used on children aged 5-11 in the US 03/11/2021
Now playing Next Health Why are COVID vaccines linked to blood clots? Scientists have answers 27/05/2021