Flu pandemic: It's only a matter of time
By KRISTIN BUEHNER and JULIE BIRKEDAL, Of The Globe Gazette
Threat of an avian “bird” flu epidemic among humans is unknown, but a future flu pandemic is not a question of if, only a question of when. “A flu pandemic will be like nothing we’ve ever seen before and can even comprehend,” said Ron Osterholm, director of the Cerro Gordo County of Public Health. “Most of us have never experienced this.”
Pandemic influenza refers to a very severe strain of influenza that has the ability to spread across the world. Pan means “all” and demos means “people.”
“Influenza pandemics are like earthquakes, hurricanes and tsunamis — they occur,” said Michael Osterholm of Minneapolis, brother of Ron Osterholm and director of the Center for Infectious Disease Research and Policy (CIDRAP). One of the world’s leading experts on public preparedness, Osterholm’s remarks were included in testimony before the House Committee on International Relations on Dec. 7, 2005.
“I believe an influenza pandemic will be like a 12- to 18-month global blizzard that will ultimately change the world as we know it today,” Michael Osterholm said. “This will occur even if we experience a milder worldwide pandemic of millions of deaths rather than many millions of deaths.”
Osterholm estimated 180 million to 360 million people could die in the next flu pandemic. “This is far and above terrorism or all infectious diseases combined.”
In a Jan. 24, 2006, television interview with Oprah Winfrey, Osterholm said pandemics occur approximately every 20 to 30 years. “It’s going to happen,” he said. “What we don’t know is what strain it will be.”
According to the World Health Organization, about three influenza pandemics occur per century at intervals ranging from 10 to 50 years.
The 20th century witnessed three pandemics: The “Asian” flu of 1957-58, the “Hong Kong” flu of 1968-69, both of which were mild, and the “Spanish” influenza pandemic of 1918-19. The 1918 pandemic killed between 50 million and 100 million people around the world, at least 675,000 in the United States.
In Iowa, more than 29,000 cases were reported in 1918-19, according to a February 2006 report by Mike Leavitt, U.S. Secretary of Health and Human Services.
Today, with a world population of 6.5 billion, more than three times that of 1918, and increased travel, even a mild pandemic could kill many millions of people, Ron Osterholm said.
The current virus strain, H5N1, is spreading very quickly and has been fatal to approximately 56 percent of the people who have been infected by it, he said.
If the H5N1 virus does lead to a pandemic, it could infect up to 30 percent of Americans and kill up to 2 million people, according to the U.S. Department of Health and Human Services. Up to 40 percent of school children could get sick.
Symptoms of the flu include severe respiratory distress, headaches and pneumonia, necessitating the use of ventilators among the seriously ill.
“Obviously, not everyone that gets this flu is going to die from it,” said Karen Crimmings, disease prevention and investigation service manager with the Cerro Gordo County Department of Public Health.
Yet to some extent, a pandemic is expected to affect everyone.
Between 30 percent and 40 percent of the workforce may miss work, Crimmings said.
VACCINE: Currently, there is no vaccine for a flu pandemic because health officials do not know what strain will cause pandemic influenza among humans. After that, it will take at least six months to prepare one, and even then, the quantity will be limited.
According to Michael Osterholm, in a year’s time, only about 300 million doses of vaccine could be manufactured, which would not be nearly enough.
A priority system for the vaccine will be established, with those determined to be most vulnerable to the flu at the top of the list.
But until the virus mutates, no one knows who will be most vulnerable — aside from the first responders, Crimmings said.
Surveillance will have to determine who these people are, Ron Osterholm said.
In the 1918 pandemic, young adults were the chief victims.
The Bush Administration has said workers in vaccine factories and people caring for the ill will get the first doses.
“That makes good sense,” Ron Osterholm said. “You’re going to need health personnel in place to maintain the health system. If frontline responders are not protected, that compromises our whole response system because they’re going to be reluctant to expose themselves by responding.”
Efforts are under way to enhance the world’s flu vaccine-making capabilities.
On May 4, 2006, CIDRAP reported the U.S. government had awarded five contracts to pharmaceutical companies, totaling more than $1 billion to develop cell-based technologies for making flu vaccines. The contracts were to develop an alternative to growing flu vaccines in eggs, a time-consuming method used since the 1950s. The contracts are for five years.
The money is from $3.8 billion Congress appropriated in December 2005 for pandemic preparations by the Department of Health and Human Services.
HOW IT SPREADS: Wild waterfowl and shorebirds are the natural host reservoir of all avian influenza viruses. The avian flu is spread through the feces of migratory birds, can be transmitted to mammals and is continuing to evolve, according to information from the U.S. Department of Health and Human Services.
The H5N1 virus has spread across eastern Asia and into Europe and Africa. The virus has passed from infected poultry to humans and other mammals and has had devastating effects on poultry farming in several nations, according to the U.S. Department of Agriculture.
The change of seasons each year, from winter to spring, sends wild birds from Asia and the continental United States north to Alaska, where they commingle while they nest and molt.
In Alaska, biologists are trapping birds and collecting samples from feces and cells from their digestive tracts for testing for viral influenza. To date, no worrisome cases have been reported.
Scientists say April through September of this year may be a crucial time frame, in terms of knowing whether the disease will spread to the United States via migratory birds.
Iowa, part of the Mississippi Flyway, is visited by a large number of migrating birds each year, making Iowans particularly vulnerable to exposure to avian influenza viruses. About 40 percent of North America’s waterfowl migrate along the Mississippi River, including 11 million ducks and geese per year, according to information from the University of Iowa College of Public Health.
Even if the virus were to appear this year in North American birds, it does not necessarily mean the start of a pandemic or a risk to poultry, Ron Osterholm said.
“It just means there are potential risks for a pandemic to occur,” he said.
As to poultry, poultry growers say that, “because of security in place in the U.S. confined poultry system, there isn’t much chance of wildfowl mixing in with poultry.”
According to the most recent information available from the World Health Organization, updated May 12, 48 countries have reported cases of the avian flu in poultry and wild birds. They include 12 countries in East Asia; 29 (total) in Europe, Siberia and Central Asia; and seven in Africa.
From 2003 to 2006, more than 200 human cases of the H5N1 strain of avian flu have been reported, with a mortality rate of more than 50 percent, according to the World Health Organization as of May 29. Countries in which laboratory-confirmed human cases of avian flu were reported are Azerbaijan, Cambodia, China, Djibouti, Egypt, Indonesia, Iraq, Thailand, Turkey and Vietnam.
HUMAN TO HUMAN: In May, Indonesia averaged one human bird flu death every 2½ days, putting it on pace to soon surpass Vietnam as the world’s hardest-hit country, the World Health Organization reported May 30.
On May 23, a possible case of human-to-human bird flu infection was reported in North Sumatra, Indonesia.
The World Health Organization acknowledged the likelihood that eight members of one family contracted the H5N1 strain of flu. The first was a 38-year-old woman who became ill April 27 and died May 4. Seven members of her family also became ill; six died.
No evidence of a mutation of the virus was found.
“New information changes every day,” Crimmings said. “It is still isolated. From my understanding, the virus has not mutated, but the investigation is continuing.”
For more information:
Web sites of the following organizations offer additional information about avian flu and a potential flu pandemic: Cerro Gordo Department of Public Health, U.S. Government Avian and Pandemic Flu Information Center, University of Minesota Center For Infectious Disease Research and Policy, Centers for Disease Control and Prevention, World Health Organizaiton.
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