Harmful effects of microorganisms
1. Spreading of diseases
Diseases in humans like common cold, tuberculosis, measles, chicken pox, polio, cholera, typhoid, hepatitis B, malaria, etc. are caused by microorganisms.
2. Food spoilage
Some micro-organisms such as fungus spoil our food. For example, when left unused under moist conditions, bread gets spoilt by fungus, producing a white cotton-like growth on the bread. This leads to food poisoning.
3. Some microbes infect cattle and poultry and thus cause heavy loss to us.