Latin America's superpower is not immune to the Colombian factor.

BBC: Venezuela

It works by neutralizing a protein produced by your immune system known as tumor necrosis factor (TNF).

CNN: Ulcerative colitis

Enbrel works by blocking a long-mysterious protein in the immune system known as tumor necrosis factor, or TNF.

FORBES: Chemical Chameleon

The mutated form of a gene called complement factor H may cause the immune system to go awry, resulting in too much inflammation in the eye.

FORBES: Magazine Article

Vitamin D also appears to play a role in healthy immune function and reducing inflammation, a risk factor for numerous diseases including cancer, heart disease and diabetes.

CNN: How much vitamin D should someone over 55 take?

Luckily, users with the new two-factor authentication feature enabled would seem to be immune to the attack.

FORBES: Enable Two-Factor Authentication On Your Apple Account To Avoid A New Password-Resetting Attack

The protein is a growth factor that leads to the production of certain immune cells, called B-cells.

FORBES: Health Care

Lack of intrinsic factor may be due to an autoimmune reaction, in which your immune system mistakenly attacks the stomach cells that produce it.

CNN: Vitamin deficiency anemia

Vitamin D levels, which play a role in the body's immune response and vary with exposure to sunlight, make latitude of residence a possible risk factor.

WSJ: The Research Report: Slapping On a Skin Patch to Combat Hay Fever

It should be cautioned that research examining the role of the immune system in development of autism is preliminary, and it is unclear if there is any immunologic factor that may be involved.

FORBES: Stem Cell Therapy To Treat Autism?