Public Health Report

Category: Public Health Programs

Should You Be Worried About Pandemics?

Photo used with permission from the Liz Ehlinger Archives, all rights reserved.

Pandemics are in the news again with two recent outbreaks beginning to cause alarm. How much danger do modern pandemics actually pose to the international community? Should Americans be concerned about a serious pandemic?

To answer these questions, we first need to introduce some history.

The Modern Pandemic

In November 2002 SARS (Severe Acute Respiratory Syndrome), a coronavirus originating near Hong Kong, began to be recognized as a serious threat and a potential pandemic. By March 2003, the international public health community was taking strong measures to contain the highly contagious disease. By the time the virus was under control in 2004, 8096 people had been infected and 774 had died, giving a mortality rate of 9.6%.

In 2009, a novel form of H1N1 began to spread in the US and Mexico. This subtype of Influenza A virus was also responsible for the devastating 1918 “Spanish Flu” pandemic. Public health officials had been preparing for an outbreak of H5N1 and so had good procedures in place for an influenza outbreak, but were not prepared with specific countermeasures for H1N1. It is much more difficult to estimate the scope and mortality rate of this disease than the SARS outbreak because of its resemblance to more common influenza infections, which are very common. According to a 2012 statistical analysis, approximately 201,200 people died of H1N1 from 2009-2010.

Currently in the news: a SARS-like virus, MERS, is proliferating in the Middle East and a new influenza subtype, H7N9, is beginning to cause concern. At an annual World Health Organization (WHO) meeting in Switzerland Monday the WHO director called MERS a “threat to the entire world” and her “greatest priority.”

So what level of effort and concern should the average person invest in these threats? What can medical professionals do to keep up with the latest outbreaks? Let’s try to sort through the responses to an epidemic.

Epidemiology

When potential pandemics arise, the WHO tracks outbreaks of these illnesses carefully and prepares an international response. In the United States, the CDC directs these efforts along with state and local public health infrastructure.

The CDC has a Health Alert Network which will email subscribers with updates on health events. It is open to everyone, though they describe this as their “primary method of sharing cleared information about urgent public health incidents with public information officers; federal, state, territorial, and local public health practitioners; clinicians; and public health laboratories.” The WHO in turn has their Disease Outbreak News feed to keep people informed of epidemic threats.

The key to epidemiology is early containment, and communication is an essential part of that. The battle against H1N1 was bolstered by a strong vaccination program, and SARS was contained with a massive public health effort which included widespread quarantines and even pre-departure screenings. But the front line of containment is letting doctors (and patients) know what symptoms to look for so that patients can be isolated and proper precautions taken.

We talked to Dr. David Hooper of Massachusetts General Hospital (MGH) about how the hospital ensures proper information is disseminated. Aside from research that doctors in the hospital may do on their own, Hooper and his colleague Paul Biddinger in the Emergency Department continually monitor email notifications from local, state, national, and international health authorities. “If an alert came in, we would make sure some version of it was disseminated to relevant staff,” he said.

Occasionally they are contacted directly for local issues but overwhelmingly this method depends on the diligence of doctors. “All of us are tied into email pretty much constantly with our smartphones and laptops,” Hooper said.

We also talked to a  Connecticut physician in a smaller practice, Dr. Hugh Blumenfeld. He relies exclusively on CDC alert emails to keep up to date on epidemic warnings.

In the recent past, these methods of communication seem to have been successful. While The Spanish Flu of 1918 claimed the lives of about 50 million people, and infected about 20% of the world’s population, we haven’t experienced a pandemic of nearly that proportion since then.

Media Response

The media tends to present stories in a way that will sell, and in the case of epidemics this means exaggerating the risk. But in this case, exaggeration is not necessarily a bad thing.

In reality, your chances of dying as part of a pandemic are quite low. During the SARS outbreak, 92% of the recorded infections were in China. Given the media storm, you might be surprised to know that not a single death from SARS was recorded in the US. Even H1N1 was not in danger of being as deadly as cancer in 2009.

But unlike cancer, pandemics are an unknown risk. We never know when some newly mutated high-mortality virus could run out of control. Because of this, we are best served treating every outbreak as if it could be disastrous (at least in terms of communication). Global travel has upped the ante in terms of how fast these diseases can spread, and we need to be well-informed and prepared to act quickly.

New Frontiers

While the new era of global travel complicates disease control, scientific research on pandemic prevention is becoming more complicated as well. A recent JAMA article on H7N9 preparedness concludes:

Another influenza pandemic is inevitable. Even with recent additional vaccine manufacturing capacity and improvements in potency testing, the global public health community remains woefully underprepared for an effective vaccine response to a pandemic. To be successful in meeting the challenge of a severe pandemic, the influenza vaccine enterprise must move forward with the development of novel antigen influenza vaccines that protect most individuals from multiple strains of influenza.

And even the development of these vaccines has become a contentious issue. The Dutch lab that identified the MERS virus recently filed a patent on some applications of the virus such as the creation of a vaccine. This may make it impossible for anyone to manufacture a vaccine for MERS without their permission. The lab insists that this will cause pharmaceutical companies to show more interest in creating a vaccine.

In order to be effective, these vaccines must be very widely distributed very quickly. If only one company can produce a vaccine for a particular virus, there must be a way to ensure that they can deliver large amounts in a timely fashion, and that there won’t be price gouging which makes it impossible to afford in the proper quantities. The WHO is currently investigating this issue.

So, should you be worried about pandemics? Not yet, but you should keep your eye on them. If you follow the scope and severity of outbreaks, you will know when it’s time to worry.

Advertisements

Teen Childbearing Drops to Record Low: What Went Right?

The National Center for Health Statistics today released an analysis of teen birth rates showing a dramatic decline since 1991. As of 2011, 15-19 year-olds of all races are having children at a rate of 31.3 per 1000 women, a record low and an impressive improvement from the 61.8 level in 1991.

As shown in the graph below, the decline is particularly apparent in non-white populations.

Birth rates for teenagers aged 15–19, by race and Hispanic origin: United States, 1991, 2007, and 2011Image

Source:CDC/NCHS, National Vital Statistics System.

You may notice that the two time intervals are very different in this chart. The 20.3 women per 1000 drop from 1991-2007 represents a decline of 1.3/year, whereas the 2007-2011 fall of 10.2 women actually represents a significant acceleration at 2.6/year. This is, however, a misleading comparison. These numbers appear to have been chosen for highest dramatic effect: both 1991 and 2007 are years which occur at the apex of an atypical upward trend. While it is true that the rates have declined significantly over the years, the effect is much exaggerated by the choice of years to highlight. This is illustrated by the following Congressional Research Service chart, which gives us the whole picture:

Image

It is worth noting that an important ideological shift in federal sex education funding occurred in 2010. According to a report issued by the Congressional Research Service last month, the federal government underwent 3 major eras in their strategies to prevent teen pregnancy.

1981 heralded the first federal program to be tasked exclusively with adolescent issues of sexuality and pregnancy, the Adolescent Family Life program (AFL). They initiated a variety of intervention programs, encouraging contraception and abstinence strategies for avoiding pregnancies and STDs. In 1996, the Title V Abstinence Education block grant and other federal funding mechanisms began to focus on abstinence-only education strategies. The focus on abstinence-only policies continued until FY2010, when funding was provided for several evidence-based programs. This evidence-based approach included the acknowledgment that many high-schoolers (47.4% in 2011) have already experienced sexual intercourse and might not be receptive to the abstinence-only approach.

There are no doubt many factors involved in the change in teen pregnancy rate over the years, but the CRS chart does imply that the initial AFL approach was not very effective, and that we have gotten better at reaching teens with all of the messages we have chosen to use since 1991.

So which states are doing best at reducing teen pregnancy rates? First let’s look at the CDC’s heat map:

Percent change in birth rates for all teenagers aged 15–19, by state: United States, 2007 and 2011Image

Source: CDC/NCHS, National Vital Statistics System.

The states with the most significant decline in teen birth rates are Arizona and Utah, both with a 35% decline from 2007-2011. In the lower 3, West Virginia, District of Columbia, and Arkansas experienced an insignificant, 15, and 16% decline respectively (with Alaska also coming in at 16%). While North Dakota also experienced an insignificant decline, it has remained below the national average in both years examined.

Looking at the 2011 teen pregnancy rates, the highest 5 states average 301% higher than the lowest 5.  While it is hard to tell from this data what is causing the large disparities between states, the broad differences indicate that it will be worthwhile to perform analyses on a state-by-state level rather than focusing on federal policy alone.