today you will get to know about some important viral diseases related to humans. so lets here begin with:
Viral disease
- Mumps: caused by virus paramyxovirus, characterised by painfull swelling of salivary glands plus high fever. Due to this the movement of jaw become very difficult. In adults testies and ovaries may become inflamed.
- Measles: caused by rubella virus. It has 10-12 days incubation period, at the end of this period buccal and respiratory passage show signs of inflammation. Loss of appetite and eruption of skin.
- Chicken pox: by varicella zoaster virus, highly contagious generally in children less than 10 yrs.
- Poliomyelitis: caused by smallest known virus enterovirus. This virus occurs only in man and it enters the body through contaminated food and water. It multiplies in the cells of intestinal wall and then infection spreads through blood stream and lymphatic system. The virus mainly attacks on CNS and destroy cell of dorsal horn of spinal cord. This result in atrophy of muscles of arms and legs as these muscles do not get nerve impulses. It usually leads to paralysis.
- Influenza: its an acute respiratory tract infection caused by influenza virus. Influenza viruses are classified within family orthomyxoviridae. It spreads mainly from person to person by droplet infection or droplet nuclei created by sneezing, coughing or talking. Influenza causes inflammation of upper respiratory tract, nose, throat and eyes.
- Common cold: caused by rhinovirus, it is transmitted through droplet nuclie and nasal secretions. Symptoms include headache, nasal secretions and cough.
- Rabies(hydrophobia): caused by RNA virus called rabies virus is neutrotrophic i.e. damages motor neurons of brains. Rabies affects all warm blooded animals and is exclusively transmitted by bites of carnivores. It leads to encephalitis, fear of water, high fever, severe headache, spasm of throat and chest leading to death. Vaccine against rabies was developed by Louis Pasteur.
- Heapatitis: is the viral infection of liver which is accompanied by loss appetite, nausea, orange brown urine and jaundice which occurs due to bilirubin released from damaged liver cells. Two types of hepatitis(heapatitis A, hepatitis B).
- Dengue fever: caused by RNA containing dengue virus. It is transmitted through bite of female tiger mosquito which is active during day time. Two types of dengue fever(classical dengue fever, dengue haemorrhagic fever).
- Yellow fever: caused by arbovirus. It is haemorrhagic aedes aegypti. Symptoms are headache, fever, vomiting, rupture of veins in kidney, spleen, liver,etc. in severe cases skin of sufferer become yellow from jaundice hence name yellow fever.
so guys be ready and start learning for exams, best of luck
thank you........