More on the numbers game
Tuesday, June 6, 2006
This commentary at Recombinomics.com notes how W.H.O. is playing the numbers game with the flu pandemic alert level. If you don’t want to change the number, it seems, you just tweak the definitions of the current level as evidence of human-to-human transmission mounts. (Note: Recombinomics was founded by Dr. Henry Niman to further the study of how viruses evolve. Here and elsewhere, Dr. Niman questions W.H.O.’s rendition of the evolutionary state of H5N1, the bird flu.)
The moves to watch may be the ones that don’t make the headlines, such as the U.S.’s deployment of some of its Tamiflu supplies to address the bird flu threat in Asia.
The United States has sent a supply of Tamiflu to Asia to help the region prepare for a human outbreak of avian influenza, U.S. Health and Human Services Secretary Mike Leavitt said on Monday.
“I am not going to specify the amount or the location, but I want to make clear that we are beginning to deploy it,” he said
The deployment of Tamiflu treatment courses to Asia is cause for concern. Tamiflu supplies in the United States are below those of most industrialized countries, so deployment from the US signals a potentially serous situation.
If nobody’s willing to say how much Tamiflu is being shipped and where, there’s got to be a reason for that. The old dependable one, that information could aid our enemies, seems dubious when the enemy is a virus. No doubt widespread alarm causes problems in and of itself, and governments would like to fight containment battles without also having to worry about the disruption fear causes, especially to economies and big business. On the other hand, gradually raising the alert level to reflect actual state of the H5N1 threat would likely generate the waves of preparation that might mitigate the tsunami of chaos that will follow should H5N1 materialize as a pandemic.
For its part, W.H.O. is hardly pooh-poohing the threat, described as “serious.” The W.H.O. bird flu FAQ outlines in broad terms how flu pandemics unfold.
Influenza pandemics are remarkable events that can rapidly infect virtually all countries. Once international spread begins, pandemics are considered unstoppable, caused as they are by a virus that spreads very rapidly by coughing or sneezing. The fact that infected people can shed virus before symptoms appear adds to the risk of international spread via asymptomatic air travellers.
The severity of disease and the number of deaths caused by a pandemic virus vary greatly, and cannot be known prior to the emergence of the virus. During past pandemics, attack rates reached 25-35% of the total population. Under the best circumstances, assuming that the new virus causes mild disease, the world could still experience an estimated 2 million to 7.4 million deaths (projected from data obtained during the 1957 pandemic). Projections for a more virulent virus are much higher. The 1918 pandemic, which was exceptional, killed at least 40 million people. In the USA, the mortality rate during that pandemic was around 2.5%.
Pandemics can cause large surges in the numbers of people requiring or seeking medical or hospital treatment, temporarily overwhelming health services. High rates of worker absenteeism can also interrupt other essential services, such as law enforcement, transportation, and communications. Because populations will be fully susceptible to an H5N1-like virus, rates of illness could peak fairly rapidly within a given community. This means that local social and economic disruptions may be temporary. They may, however, be amplified in today’s closely interrelated and interdependent systems of trade and commerce. Based on past experience, a second wave of global spread should be anticipated within a year.
As all countries are likely to experience emergency conditions during a pandemic, opportunities for inter-country assistance, as seen during natural disasters or localized disease outbreaks, may be curtailed once international spread has begun and governments focus on protecting domestic populations.
Unfortunately, the time to prepare for the possibility of a flu pandemic is before it’s clear to everyone that immediate preparation is necessary. That’s when there’s suddenly not enough of anything. I’ve read enough now to sigh and start making a list of what I’ll buy using this year’s tax refund. I’d rather be caught prepared for a disaster that never comes (insofar as one can prepare) than unprepared for a disaster that does. Beyond that, one has little control.
Growing up, I confronted time and again two possible reactions one can have to those situations over which one finally has little control. Middle-of-the-night tornado warnings offer an example. (Hurricanes offer another; but this post is already long.) My father stayed up as late as necessary on stormy nights to hear the weather reports on the radio. Whenever a tornado warning was announced, he would herd us out of bed and down to the basement to install us in the Olds ‘98. He had a plan. When the whole house fell in on us, we would plow our way out in the big car. We were probably the only peole in the county sitting in our car in our basement during tornado warnings. He spent every moment tightly wound with anxiety, as if vigilance could change the course of a funnel cloud. My mother cooperated with the car plan, which my father thought a stroke of genius, but she had the gall to bring a pillow and fall asleep, if she could, while the storm reverberated all around the house. It wasn’t that she was oblivious; she was just willing to accept that there wasn’t anything more to be done; that what would be would be. I learned from both of them - from my father the importance of strategizing and preparation, from my mother a certain peace that comes when all is done that can be done and matters are out of our hands.
