#immune response

Older and immunocompromised people and those with underlying health conditions could benefit most from additional shots.

The booster is recommended for organ transplant recipients, people receiving cancer treatment and people with advanced or untreated HIV.

Experts call for heightened precautions and better, more intensive therapies for COVID-19 patients with weakened immune systems.

People with immune deficiency may not respond as well to vaccines but could still gain some protection.

Many with hep C or another liver disease have questions about what the side effects of COVID vaccines might be.

Natural immunity and vaccine responses may be weaker in people with immune suppression, so they should get their second dose promptly.

Long-lived memory immune cells continue to provide protection even after antibody levels drop.

The population of hepatitis C within the body is interconnected rather like an online social network and cooperates to evade the immune system...