Explanation

Epidemiology, the study of epidemics, is sometimes defined as the medical aspect of ecology, for it is the study of diseases in animal populations. 

Explanation

 Hepatitis A is primarily spread through contaminated food or water that has been in contact with infected feces, meaning it's transmitted through the fecal-oral route. 

Explanation

Malady means disease.

It refers to a physical or mental illness or disorder.

It often a serious or chronic one.

Explanation

A ( borehole latrine) pit latrine, also known as a pit toilet, is a type of toilet that collects human feces in a hole in the ground.

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typhoid fever can be contracted including:

using a toilet contaminated with bacteria

and touching your mouth before washing your hands.

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Drinking such water is unsafe for our health

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ND1-2-2023

Explanation

a person having a heart br most likely feels pain In Chest

Most heart attacks involve discomfort in the center or left side of the chest that lasts for more than a few minutes 

The discomfort can feel like uncomfortable pressure, squeezing, fullness, or pain.

Explanation

Virus is an ineffective agent that typically consists of a nucleic acid molecule in a protein coat,

is too small to be seen by light microscopy,

and is able to multiply only within the living cells of a host.

Explanation

Tetanus is caused by a bacterium (Clostridium tetani), not a virus.

Explanation

• Malaise does not include after the major operation or injury
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• fever, blood loss, and negative nitrogen balance include after the major operation or injury
• Negative nitrogen balance is associated with burns, serious tissue injury, fever, and during the period of fasting. 
  
  

Explanation

• The time required for a partial thickness to heal is less than 3 weeks
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•  The partial thickness required time to heal is 07-21 days.
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Explanation

 Out of the options provided, influenza is not a waterborne disease, while cholera, amoebiasis, and typhoid are.