vaccines don't always work on people with immune system deficiency/ on immuno-suppressants, like people after surgeries, transplants, or who have hiv, lupus etc as well as babies who haven't developed immune systems yet…
vaccines don't always work on people with immune system deficiency/ on immuno-suppressants, like people after surgeries, transplants, or who have hiv, lupus etc as well as babies who haven't developed immune systems yet…