Understanding the Ever-Present Threat of Flu Pandemics

A flu pandemic occurs when a new influenza virus emerges, one to which people have little or no immunity, and for which there is no pre-existing vaccine. Such viruses spread easily from person to person, causing serious illness and potentially sweeping across countries and continents in a short span. The highly pathogenic Influenza A virus subtype H5N1, commonly referred to as "bird flu" or "avian influenza," is a prominent example of an emerging avian influenza virus posing a significant pandemic threat. Although bird flu encompasses various subtypes of avian influenza, H5N1 has garnered particular concern due to its severe implications.

Historically, flu pandemics have had devastating impacts. The 1918 "Spanish Flu," caused by the H1N1 influenza A virus, is a grim benchmark, killing an estimated 50 million to 100 million people within 18 months. Subsequent pandemics, though less catastrophic, have also been deadly. In 1957, the "Asian Flu," attributed to the H2N2 virus, claimed over 100,000 lives. The 1968 "Hong Kong Flu," driven by the H3N2 virus, resulted in up to 750,000 fatalities. These pandemics underscore the recurring threat posed by influenza viruses.

The emergence of H5N1 in 1997 marked a critical moment in avian influenza history. For the first time, an avian influenza virus was found to transmit directly from birds to humans. The initial outbreak in Hong Kong led to 18 hospitalizations and 6 deaths. In 1998, H5N1 infected two more individuals in Hong Kong, resulting in one fatality. This direct transmission heightened global awareness of the pandemic potential of avian influenza viruses.

Subsequent years saw further outbreaks of various avian influenza strains. In 2003, the H7N7 strain infected 83 people, resulting in one death. By 2004, the H5N1 and H7N3 strains had infected dozens in Vietnam and Thailand, as well as two individuals in Canada, with many fatalities. The virus continued to spread, infecting people in Vietnam, Cambodia, Indonesia, and Thailand by 2005, causing approximately 60 deaths. During this period, strains were also detected in animals in countries such as Romania, Greece, Turkey, Russia, and England, signaling a broader geographic spread.

In response to these threats, global health initiatives have focused on increasing antiviral medication stockpiles and conducting extensive testing on wild animals and birds. By 2006, these efforts intensified, reflecting the urgent need to mitigate the risk of a pandemic. Advances in antiviral drugs and vaccine research continue to be pivotal in preparing for potential outbreaks.

The constant evolution of influenza viruses and their ability to cross species barriers underscore the ongoing threat of a flu pandemic. Vigilance, research, and preparedness remain essential to combat this ever-present danger, ensuring that global health systems are equipped to respond swiftly and effectively to emerging influenza viruses.
Understanding the Ever-Present Threat of Flu Pandemics

History of bubonic plague

The human disease of plaque is caused by the invasion of the body by a bacterium, Pasteurella pestis, which is primarily an internal parasite of rodents and particularly of the rat.

The great scholar Ibnu Khaldun lived through the horrors of the Black Death wrote: the East and West was visited by a destructive plague which devastated nations and caused populations to vanish.

Outbreaks of bubonic plague have reached pandemic proportions on inly three occasions in recorded history:
*Known as Justinian’s Plague, spread through Middle East and the Mediterranean in the 6th century AD. The plague helped destroy the Roman Empire in the East.

*Black Death 14th century. Beginning in 1347, plague spread from western Asia to the Middle East and Europe include England, Scandinavia. The Black Death entered European when to struck a Mongol army attacking the city Kaffa. Within the first four years, no fewer than 20 million Europeans died.

*Emerged at the end of the 19th century, worldwide. Emerging from its wild rodent reservoir in the Himalayan borderlands between China and India soon after 1855 and travelling this time to east, infecting densely populated province of south China before attacking Canton and then the British colonial port of Hong Kong in 1894.

In 1905, the India Research Commission was established to carry out a comprehensive research programme, and some of Britain’s best medical scholars joined it.

They proved definitely that plague was basically a rodent disease and that infected populations of wild rodents functions as reservoirs of plaque contagion.
History of bubonic plague

History of influenza

In March of 1918, American soldiers training in Camp Function, Kansas, suddenly came down with a particular strong strain of the flu.

Many of those who got sick, contracted pneumonia because their bodies were so weak from having been so ill.

The term influenza stems for the Latin word influere, which means ‘flowing into’ or ‘creeping into’. People in fifteenth-century Italy thought the sickness was caused by the ‘influence’ of the stars, so they named it ‘influenza’.

During 3000 BC to 2000 BC, influenza first time capable of infecting humans. It probably arises in central Asia.

The earliest descriptions of influenza are commonly attributed to Hippocrates. In the writings of Hippocrates in 412 BC there is a description of an epidemic in North Greece with symptoms similar to influenza.

Roman historian Livy who lived between 59 BC and 17 AD described a flu-like disease that attacked the Roman army and the enemy soldiers they were fighting.

Between 1781 and 1782, an influenza pandemic infected two-thirds of Rome’s population and three-fourths of Britain’s population. The disease continued to spread in North America, the West Indies and South America.

The spread of this pandemic culminated with an influenza epidemic in New England, New York and Nova Scotia in 1789.

While influenza has afflicted humans for centuries, it has been claimed that it was in the nineteenth century that influenza became an endemic, disease in the majority of the countries in the world, regularly producing large epidemic and pandemics. The first worldwide pandemic of influenza happened in 1833.

In 1940 the influenza B virus was isolated and the influenza C virus in 1949. Since 1945, an active influenza vaccination has been available.
History of influenza

Bird Flu H5N1

A flu pandemic occurs when a new influenza virus emerges for which people have little or no immunity, and for which there is no vaccine. The disease spreads easily person-to-person, causes serious illness, and can sweep across the country and around the world in very short time.

The highly pathogenic Influenza A virus subtype H5N1 virus is an emerging avian influenza virus that has been causing global concern as a potential pandemic threat. It is often referred to simply as "bird flu" or "avian influenza" even though it is only one subtype of avian influenza causing virus.

In 1918 the “Spanish Flu” pandemic swept the world, stemming from the H1N1 influenza A virus, and killed between 50 million to 100 million people during the 18 months of the pandemic. In 1957, the "Asian Flu" outbreak claimed more than 100,000 lives. To blame was the H2N2 influenza virus. In 1968, the H3N2 virus was responsible for the loss up to 750,000 lives in the "Hong Kong Flu" pandemic.

1997: In Hong Kong, avian influenza A (H5N1) infected both chickens and humans. This was the first time an avian influenza virus had ever been found to transmit directly from birds to humans. During this outbreak, 18 people were hospitalized and 6 of them died. In 1998, H5N1 is found in two more people in Hong Kong. One eventually dies.

In 2003, 83 people are infected with the H7N7 strain, with one fatality. In 2004, the H5N1 and H7N3 strains infected dozens of people in Vietnam and Thailand--and two in Canada. Many of these people died.

In 2005, strains have been found to infect people in Vietnam, Cambodia, Indonesia, and Thailand. Around 60 people have died, and strains are being detected in animals now for the first time in such places as Romania, Greece, Turkey, Russia, England In 2006, increased numbers of Antiviral Medication, stockpiling of medications and many tests around the world on wild animals and birds.
Bird Flu H5N1