Why is rabies afraid of water?

Written by Xiong Hong Hai
Infectious Disease
Updated on March 17, 2025
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The reason why rabies fears water is because the rabies virus proliferates extensively in the brain, causing massive damage to brain tissues and cells. When it affects certain swallowing nerves and glossopharyngeal nerves, and causes extensive necrosis of brain and liver cells, these symptoms will appear. In addition to fearing water, there is also a fear of bright light, wind sounds, and noise. There will be evident fear-induced spasms, and eventually, it leads to death due to coma, and it is also prone to fever.

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Written by Xiong Hong Hai
Infectious Disease
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Can rabies be inherited?

Rabies is an infectious disease, not a hereditary disease, and there is no possibility of it being inherited. It is mainly caused by being bitten by dogs, cats, or bats carrying the rabies virus. If timely treatment and intervention are not administered after being bitten by these animals, there is a chance of contracting the rabies virus. The rabies virus attacks the human nervous system and eventually proliferates extensively in the brain, leading to the exhaustion of brain functions and resulting in death.

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Written by Xiong Hong Hai
Infectious Disease
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Is rabies contagious?

Rabies is a contagious disease, and currently, rabies is primarily transmitted by bites or scratches from rabid dogs. Additionally, there are risks of infection from bites by cats during their symptomatic phase, as well as from bats. Transmission from human to human is extremely rare. The rabies virus mainly resides in the saliva of dogs or cats during their symptomatic phase. Therefore, the risk is significant if bitten by a rabid dog. Rabies is a fatal disease, with an infection leading to 100% mortality, which makes prevention crucial.

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Written by Xiong Hong Hai
Infectious Disease
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How long does rabies usually take to manifest?

Rabies generally has a variable incubation period. The question actually refers to the incubation period of rabies. The duration of this period can vary widely; the shortest is about five days before onset of the disease, while the longest can reach up to eight years. The average incubation period is two to three months, with cases exceeding one year accounting for 2%-3% of instances. The length of the incubation period is related to factors such as the virulence of the virus, and the nerve distribution at the site of entry. The greater the amount of the virus, the stronger its virulence, and the richer the nerve supply at the site of entry, especially if it is closer to the central nervous system, the shorter the incubation period will be.

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Written by Xiong Hong Hai
Infectious Disease
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How long is the longest incubation period for rabies?

The incubation period of rabies is generally between one to three months, and it is rare for the disease to have incubation period longer than a year. Most cases usually fall within one to three months, according to the 2016 Rabies Prevention Guide. The longest recorded incubation period for rabies mentioned in the guide was six years, but such cases are extremely rare. Therefore, if a person is bitten by a dog and does not develop the disease within a year, it is generally considered that they were not infected with rabies at the time of the bite. Rabies is a fatal disease, with a 100% fatality rate upon infection, so prevention is crucial.

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Written by Xiong Hong Hai
Infectious Disease
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Does rabies cause coughing?

Rabies generally does not cause severe coughing, but in the late stages of the disease, coughing can occur. Eventually, due to spasms and paralysis of the respiratory muscles, some sputum cannot be expelled, which stimulates the respiratory tract to produce more secretions, possibly leading to frequent coughing. The main symptoms of rabies are a distinct fear and restlessness towards water, light, and wind. Rabies ultimately leads to death due to respiratory muscle failure and paralysis of the respiratory system.