Excess of physical exertion may precipitate facial and eye muscle spasm. It can be due to muscle fatigue. Side effects of certain medicines can produce facial twitching. Drinking excess of coffee, or any other caffeinated drinks can cause involuntary twitching of muscles, facial muscles are one of them.
Blood and organ donors are screened in many endemic areas and, since 2006, in the US to prevent transfusion- and organ transplantârelated Chagas disease. Key Points Chagas disease is caused by Trypanosoma cruzi, which is transmitted by Triatominae (reduviid, kissing, or assassin) bugs. Infection is endemic in South and Central America and Mexico; an estimated 8 million people worldwide, including an estimated 300,000 people in the US (primarily immigrants), are infected.
Chagas disease is infection with Trypanosoma cruzi, transmitted by Triatominae bug bites or, less commonly, via ingestion of sugar cane juice or foods contaminated with infected Triatominae bugs or their feces, transplacentally from an infected mother to her fetus, or via blood transfusion or an organ transplant from an infected donor.