Tag: communicable diseases

An airborne disease is any disease that is caused by pathogens and transmitted through the air. all respiratory droplets. The airborne transmission that occurs utilizes small particles or droplet nuclei that contains these infectious agents or pathogens. These particles and droplets are capable of remaining suspended in air for extended periods of time. Inhalation of these particles results in respiratory tract infection. Whooping cough (Bordetella pertussis), meningitis (Neisseria species), diphtheria (Corynebacterium diphtheriae), pneumonia (Mycoplasma pneumoniae, Streptococcus species) and tuberculosis (Mycobacterium tuberculosis) are some of the bacterial diseases that spread through air. 

Cholera is caused by a bacterium called Vibrio cholerae. A person gets cholera by drinking water or eating food infected with the bacterium. Once swallowed, it settles in the lining of the small bowel and releases a toxin (poison) that can cause the body to flush liquid into the small bowel, resulting in watery diarrhoea. Typhoid fever is an acute illness associated with fever caused by the Salmonella typhi bacteria. The bacteria spread through contaminated food or water and occasionally through direct contact with someone who is infected. 

City dwellers are facing the acute problems of water and vector borne diseases due to water logging and improper solid waste management and sanitation. The water logging and reprehensible drainage, contamination of water of upper layer from which major portion of the people get the polluted water through shallow bored hand pumps for drinking and other domestic purposes, are main cause of water borne diseases in the city. It is evident from studies that about 70.5 % population is suffering from the abdomen diseases cause by using polluted and contaminated water. Japanese encephalitis, jaundice, cholera, colitis, diarrhoea, dysentery, typhoid and skin diseases are common.

Cobras belong to the elapids sub-group of snakes and there

are over 270 species of cobras. Cobra's venom

contains postsynaptic neurotoxins that spread rapidly into the victim's

bloodstream and affects the lungs causing respiratory failure and eventually, death.

The diseases which are transmitted through contaminated air are known as airborne diseases. When the person lives in an overcrowded area which is poorly ventilated house, the person may suffer from breathing and airborne related diseases. The person may suffer from respiratory infections and disorders.

The disease can be transmitted directly or indirectly depending on the surrounding factors like example air , water and soil. Therefore, (b) is the correct answer.

Insects like mosquitoes act as a vector to transfer infection from one host to another. This happens when one mosquito sucks blood from the infected person and the same mosquito bites a healthy person.  Therefore, (a) is the correct answer.