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The Swine Flu Virus

(Dr. H. M. Behl - exclusive to Veria.com)

According to WHO there is a global increase in H1N1 cases. Till date there were 2371 laboratory-confirmed cases in 24 countries worldwide, with 42 deaths reported from Mexico. There are 896 laboratory confirmed human cases, including two deaths in the United States. Younger people, of either sex, appear to be more prone to infection.

Pigs are known to have viral diseases and influenza, however the current swine flu influenza in humans was not known earlier. This influenza is caused by swine origin virus called H1N1. This strain of the virus is new and was not detected earlier till date, hence it has been named as A(H1N1). The correct nomenclature is Swine-origin Influenza A (H1N1) Virus (S-OIV). This is a serious and confirmed threat that will change priorities for many people and for many countries. World Health Organization (WHO), US government and other agencies are working overtime to find solutions and avoid spread of the disease. It does call for a caution yet it is not a potential threat to global public health.

How potential is the risk of animal viruses infecting humans?

We know of several animal viruses trespassing to humans and being fatal, though the contamination can be controlled since there is very little human to human transmission.

In September 1994, in Hendra, Brisbane Australia one racehorse developed a strange disease. This horse died in two days. It was contagious since other mares and horses too fell sick. They developed fever, respiratory distress, facial swelling and clumsiness. Later, 12 more animals died of failed kidneys and breathlessness. Even the trainer died after some days. The disease was due to a virus, never reported earlier, initially named equine morbillivirus (horse virus), later known as Hendra virus. How, why and from where this deadly virus came all of a sudden and spread in just 12 hours and left the horses dead thrashing and gasping desperately? Scientists discovered that the culprit was a fig tree where bats assembled; and the horse strayed down the tree and caught virus. The bats carried the virus. The virus did not affect the bats but was fatal for horses and human beings. Bats carry virus for SARS and Nipah.

Pathogens like this virus are natural components of an ecosystem. They have their favored targets. Occasionally, the pathogen may also shift to a new target due to accidents, aberrations, circumstances, opportunities or exigencies. When a pathogen leaps from non human animal to a person and succeeds there in making trouble, the result is zoonosis, a science of animal-human disease relationship.

Many animals like bats carry pathogens (such as virus) and may never have any adverse effect but when the pathogen changes the host, it may be deadly to the new host. We are aware of bird flu and HIV. Ebola, bubonic plague, yellow fever, monkey pox, Lyme disease, West Nile fever, strains of swine influenza, rabies, hantavirus, and many strange afflictions may be due to pathogens transferred from animals. 60 % of human infectious diseases are shared with animals. Some like rabies are lethal even with a clear scientific understanding about them. Others are new and sporadic.

SARS came from northeast China in 2003, and spread in nine countries killing 774. Initially it was thought to be carried by small mammal but later found that the horseshoe bat carries it. Rabies is very lethal and has 100 % mortality. The disease is caused by virus that rests in vampire bats.

It is difficult to eradicate a disease when its pathogen escapes to the host animal. Smallpox could be eradicated with WHO efforts since it infects humans or primates but not horses and bats. The virus had no way to hide. On the other hand, yellow fever is also infectious to both monkeys and humans, but virus can hide in several species of mosquitoes so it can never be eradicated.

Virus are the most dangerous since they evolve quickly, are unaffected by antibiotics, can be elusive, are very versatile, inflict high rate of mortality and are simply very mean. They cannot run, walk, swim, crawl but they ride. SARS, monkey pox, rabies, Ebola, West Nile, Machpo, dengue, yellow fever, Junin, Nipah, Hendra, influenza, HIV are all caused by viruses.

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