Many pandemic restrictions have been lifted for the vaccinated, but for the millions of people with conditions that suppress the immune system, who may not get as much protection from a Covid-19 vaccine, life has been trickier. On Thursday the US Centers for Disease Control and Prevention's Advisory Committee on Immunization Practices (ACIP) will discuss whether immunocompromised people need a third shot to better protect themselves from Covid-19, since the vaccines may not work as well for them. Until then, people with weaker immune systems still have to figure out how to navigate a return t...