The early symptoms of the disease are sometimes so mild that it becomes difficult to recognize the true nature of the disease In some cases the pre-eruptive stage lasts for three to four days and is characterized by fever, coughing, sneezing, running of nose and redness of eyes.
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It is an acute infectious disease of a very distressing nature, caused by a micro-organism. It is a disease of respiratory tract followed by severe attacks of coughing frequently ending in a whoop.
Malaria is the most important of all tropical diseases and one of the worst curses of humanity, remains even today a serious health problem in our country.
The word virus is derived from the Latin language, which means morbid poison. Various serious diseases such as Influenza, Polio, and Smallpox are caused by virus. Viruses are obligate parasites. They are studied under Electron microscope. Among the plant viruses, Tobacco Mosaic Virus (TMV) has been studied in great detail.