Pathogens are organisms organisms: living entities-ie animals, plants or microorganisms. that cause disease. They include microorganisms such as bacteria, viruses, fungi and protozoa.ood contaminated with protozoa can cause infections such as amoebic dysentery, of which severe diarrhoea is a symptom. Some protozoa are parasites. These organisms live on, or inside, another organism and cause it harm. Malaria is a disease caused by protozoa that live in the blood.
In most cases, erectile dysfunction is caused by something physical. Common causes include: 1  Heart disease. 2  Clogged blood vessels (atherosclerosis). 3  High cholesterol. 4  High blood pressure. 5  Diabetes.
The incidence of erectile dysfunction in patients taking antidepressants has been reported to be as high as 35%. Tricyclic antidepressants, such as imipramine (Tofranil), amitriptyline (Elavil), protriptyline (Concordin), and clomipramine (Anafranil), have been reported to cause erectile dysfunction.here are also several reports of erectile dysfunction associated with gemfibrozil (Lopid) use and resolution of the erectile dysfunction with discontinuation of the drug. Similarly, the lipid-lowering medications pravastatin (Pravachol) and lovastatin (Mevacor) have also been associated with erectile dysfunction.