Disease caused by pathogens
William Harvey discovery the blood circulation.
Salmonella typhi is a pathogenic bacterium which causes typhoid fever in human beings. Typhoid fever could be confirmed by Widal test.
Bacteria like Streptococcus pneumoniae and Haemophilus influenzae are responsible for the disease pneumonia in humans which infects the alveoli (air filled sacs) of the lungs.
Dysentery, plague, diphtheria, etc., are some of the other bacterial diseases in man.
Rhino viruses cause – the common cold.
AIDS is caused by the Human Immuno deficiency Virus (HIV), a member of a group of viruses called retrovirus.
Malaria disease is caused by protozoans plasmodium, a tiny protozoan is responsible for this disease. Different species of Plasmodium (P. vivax, P. malaria and P. falciparum) are responsible for different types of malaria.
Entamoeba histolytica is a protozoan parasite in the large intestine of
human which causes amoebiasis (amoebic dysentery).
Ascaris (common round worm) and Wuchereria, the filarial worm, are some of the helminths which are known to be pathogenic to man. Ascaris, an intestinal parasite causes ascariasis.
Wuchereria (W. bancrofti and W. malayi), the filarial worms cause a slowly developing chronic inflammation of the organs in which they live for many years, usually the lymphatic vessels of the lower limbs and the disease is called elephantiasis or filariasis
Many fungi belonging to the genera Microsporum, Trichophyton and Epidermophyton are responsible for ringworms