HIV is a retrovirus that impairs the immune system and causes AIDS. Learn about symptoms and treatment.
Pneumonia is an infection that inflames air sacs, which may fill with fluid, in the lungs. Learn about symptoms and treatment.
Sepsis is a condition caused by an overwhelming immune response to an infection in the body. Learn about symptoms and treatment.
Meningitis is inflammation of the brain and spinal cord membranes, usually caused by an infection. Learn about symptoms and treatment.
Guillain-Barré syndrome is a neurological condition in which the immune system attacks healthy nerve cells. Learn about symptoms and treatment.
COVID-19 is the disease caused by the SARS-CoV-2, the 2019 novel coronavirus.
Lyme disease is a tick-borne infection that can lead to neurological complications. Learn about symptoms and treatment.
Tuberculosis is highly contagious and can be deadly. Learn about symptoms and treatment.
Long COVID refers to new or recurring symptoms that occur four or more weeks after an infection with SARS-CoV-2, the virus that causes COVID-19.
Parasitic diseases are infections caused by organisms that are often microscopic. Learn about symptoms and treatment.