Plague is an infectious disease transmitted to man by infected rat fleas. It is primarily a zoonotic disease. The causative agent is Y. pestis which is present in the bubo’s, blood, spleen and liver of infected persons.
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Hookworm infection is defined as any infection caused by Ankylostoma or Nectar. Infection of either or both the organisms can occur in the same person.
Food poisoning is defined as ‘ acute gastro-entities caused by ingestion of food or drink contaminated with bacteria, their toxins or chemicals, plant and animal poisons’.
Typhoid fever is a communicable disease caused by Salmonella tophi. The term enteric fever includes both typhoid fever and paratyphoid fever. The symptoms of typhoid fever are:
It is also known as infectious hepatitis. It is caused by hepatitis A virus. It produces symptoms such as fever, chills, headache, weakness and jaundice. It is a benign disease and recovery occurs in a few weeks.
It is an infectious disease caused by Hordetella pertussis. It occurs in young children. It is characterized by mild fever and irritating cough.
Diphtheria is an acute infectious disease caused by Corynebat- erbium diphtheria. It is a Gram positive rod shaped bacteria. It affects mostly children in the early school years.
Chicken pox(or varicella) is a highly infectious disease. It is caused by Varicella-Zoster (V-Z) virus. It is characterized by vesicular rash which may be accompanied by fever and malaise.