1. If the adaptive immune response is powerful enough, then it could leave a lasting memory of the infection that will give protection in the future. => Conjuctive adverb time
2. However, there are many others that are pretty forgettable. => Conjuctive adverb contrash
3. However, even if you are not completely immune it is possible a second infection would not be as severe. => Conjuctive adverb contrash
4. However, the scientific consensus is that testing is the issue with patients being incorrectly told they were free of the virus. => Conjuctive adverb contrash
5. The idea is if you pass the antibody test then you are safe to go back to work. => Conjuctive adverb time
https://www.bbc.com/news/health-52446965
