Important Modern viral diseases

By  extensive use of vaccination and chemotherapy. Certain  serious viral diseases of the past. Like smallpox. Have been completely or largely eradicated on global scale under the relevant programmes of world health organization (WHO) However significant changes inhuman thinking and personal and social lifestyles of human being in the present ear have give rise to a number if social problems like pollution. Scant  sanitation and hygiene. Population explosion uncontrolled sexual behaviour lack of eugenic values, etc. And problems like these have exposed human beings to the severity of some viral diseases. Viral diseases like dengue, yellow fever influenza gastroenteritis, hepatitis, conjunctivitis, etc. Sporadically occur and may become endemic, but two viral diseases AIDS an Cancer are fast spreading to become worldwide and people are becoming panicky because of these dreaded diseases.