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: Spread by blood sucking assassin bugs, this disease is caused by the protozoa Trypanosoma cruzi, which is passed on to the secondary hosts, humans, when these bugs feed on the hosts' blood, and defecate immediately near the site of the bite.iardiasis: This is a form of diarrhea caused by the infectious protist Giardia lamblia. Giardia cysts can be transmitted on coming in contact with an infected person, who does not maintain proper personal hygiene, or by coming in contact with contaminated water.