All influenza viruses have the potential to can change. It is possible that an avian influenza virus could change so that it could infect humans and could spread easily from person to person. Because these viruses do not commonly infect humans, there is little or no immune protection against them in the human population. If an avian virus were able to infect people and gain the ability to spread easily from person to person, an â€œinfluenza pandemicâ€ could begin.Â
An influenza pandemic occurs when a new influenza virus appears against which the human population has no immunity, resulting in several, simultaneous epidemics worldwide with enormous numbers of deaths and illness.
Go to the website to know about some epidemics that killed humans brutally in the past. Smallpox, cholera, bubonic plague and influenza were some of them. When there is an outbreak across the international borders then this is defined as a pandemic. This happened with smallpox which has killed more than 300 to 500 million people since its existence.
With the increase in global transport and communications, as well as urbanization and overcrowded conditions, epidemics due the new influenza virus are likely to quickly take hold around the world.
A New influenza Virus: How It Could Cause A Pandemic
Influenza A and influenza B are 2 of the 3 types of influenza viruses associated with annual outbreaks and epidemics of influenza. The third type, influenza C, causes only mild disease and has not been associated with widespread epidemics or pandemics. Annual outbreaks of influenza are due to minor changes in the surface proteins of the viruses that enable the viruses to evade the immunity humans have developed after previous infections with the viruses or in response to vaccinations.
Only influenza A virus can cause pandemics. When a major change in either 1 or both of their surface proteins occurs spontaneously, no one will have partial or full immunity against infection because it is a completely new virus.Here is how we gain immunity to some diseases. This happens because we acquire antibodies directly from our mother when we are in her womb.Continue reading this on how we gain immunity all our lives. As our body is exposed to new organisms we start to gain some specific immunity. When infections occur they create memory cells. This helps to protect us from any future infections from a related or the same organism. If this new virus also has the capacity to spread from person-to-person, then a pandemic is most likely to occur.
Consequences Of An Influenza Pandemic
During the last century, 3 influenza pandemics caused millions of death worldwide, social disruption and profound economic losses. Influenza experts agree that another pandemic is likely to happen. Epidemiological models project that in industrialized countries alone, the next pandemic is likely to result in 57-132 million outpatient visits and 1.0-2.3 million hospitalizations, and 280 000-650 000 deaths over less than 2 years. The impact of the next pandemic is likely to be greatest in developing countries where health care resources are strained and the general population is weakened by poor health and nutrition.