We present here two images related with an exposure to enviromental agents that transmit a disease to a human being.The first one (A) was extracted from the feces of a patient after a travel to a developing country. The symptoms referred for the patients were abdominal pain and rectorragia.The second image (B) was obtained from a 70-year-old man working with cows in a dairy farm in Spain.
Figure A. Ascaris lumbricoides
The cycle of ascaris included the small intestine, liver and lungs, where it produces cough, dyspnea and eosinofilia (Loeffler´s syndrome).
The main causative agents of bovine tuberculosis are M. bovis and M. capprae; there is a zoonotic transmission through close contact with infected cattle or comsumption of contaminated animal products.