Highlights include our CRE soapbox (it’s only 4%!), NCov updates, the surprising news about flu droplets (oh it’s surprising), Hong Kong and the risks of high population density, the resilience of viruses, and an overview of pandemics. Happy Friday!
Drug-resistant CRE (carbapenem-resistant Enterobacteriaceae) has been in the news often this week, following the CDC’s warning about the bacteria. Now, clearly this is a concern, but before we freak out let’s look at some of the figures behind this story. First, the statistic regarding CRE’s case fatality- almost every news source we’ve seen has indicated it’s 50% – aren’t what they seem. What the sources don’t say is that it’s 50% if, and only if, the infection becomes septicemic. Septicemia as a result of almost any bacterial infection is very dangerous. Second, CRE is really only of concern amongst the immunocompromised and those in long-term treatment for prior conditions. If you’re a healthy adult in possession of an active immune system, you’re chances of becoming infected are minuscule. Third, yes the rate of infection from CRE has increased in the last decade, but again let’s keep the actual number in mind – four percent.
Antibiotic-resistant pathogenic bacteria are a real concern, and steps should absolutely be taken to mitigate their growth and prevent their spread. However, disproportionately scaring the public is not the way to do that, and can be detrimental in the long run – the “boy who cried wolf” anyone? But our soapbox aside, check out the CDC’s review if you haven’t already.
CDC – “Untreatable and hard-to-treat infections from CRE germs are on the rise among patients in medical facilities. CRE germs have become resistant to all or nearly all the antibiotics we have today. Types of CRE include KPC and NDM. By following CDC guidelines, we can halt CRE infections before they become widespread in hospitals and other medical facilities and potentially spread to otherwise healthy people outside of medical facilities.”
Yesterday the WHO reported another fatality from the novel coronavirus, bringing the total number of cases up to 14 and the fatalities to eight. This case is of special concern because it remains unclear how the man became infected.
WHO – “The Ministry of Health in Saudi Arabia has informed WHO of a new confirmed case of infection with the novel coronavirus (NCoV). The patient, a 69-year-old male, was hospitalized on 10 February 2013 and died on 19 February 2013. Preliminary investigation indicated that the patient had no contact with previously reported cases of NCoV infection and did not have recent history of travel.”
According to this study, the tiny aerosol droplets of flu we exhale when sick contain nine-times the amount of virus than the larger cough/sneeze generated droplets. So the next time an infected colleague/friend/loved one walks toward you, make them stop four feet away and calmly explain that their breath is infectious. (GMU Biodefense is not responsible for the implications of you calling the breath of a colleague/friend/loved one infectious).
Medical Express – “People may more likely be exposed to the flu through airborne virus than previously thought, according to new research from the University of Maryland School of Public Health. The study also found that when flu patients wear a surgical mask, the release of virus in even the smallest airborne droplets can be significantly reduced. ‘People are generally surprised to learn that scientists don’t know for sure how flu spreads,’ says Donald Milton, M.D., Dr.P.H., who directs the Maryland Institute for Applied Environmental Health and led the study of influenza virus aerosols published in the journal PLoS Pathogens…”
Population density remains an important factor in understanding pandemic potential, and Hong Kong is close to the top of the list in terms of people-per-square-mile. As housing prices continue to increase, many of the city’s 7.2 million residents are settling for smaller and more cramped living quarters.
Bloomberg – “Hong Kong electrician Chan, who shares a mold-stained toilet with his neighbors, says he’d move out if it weren’t for the rising cost of accommodation. Last year, residents were forced to bathe using a shared kitchen sink for six months when a plastic shower hose in the communal bathroom broke, Chan said…Chan Sung-ming says the coughs and sneezes echoing through the plywood walls of his windowless, 60- square foot Hong Kong apartment get him thinking: is there a bug going around and could it be deadly?”
Wonderful. As if viruses aren’t good enough at surviving against all possible odds in the first place. For things that technically aren’t alive (I know, I know, I read the piece about viral immune systems as well – they’re still undead in my book), they are disturbingly resilient.
Futurity – “Researchers have uncovered a virus inside a host with a non-standard nuclear genetic code—one that differs from the standard genetic code that almost all living things use to produce proteins.’The finding is significant because it shows that these viruses can overcome what appears to be an insurmountable change in the host genome,’ says researcher Derek J. Taylor, professor of biological sciences at the University at Buffalo.’So the fact that we haven’t previously seen any viruses in these species with a modified genetic code may not be because the viruses can’t adapt to that shift. It may be that we haven’t looked hard enough.'”
A good overview of the basics of pandemics (I tend to disagree with their bioterror assessment, but to each their own!)
STRATFOR – “”The potential for a disease to spread is measured by its effective reproduction number, or R-value, a numerical score that indicates whether a disease will propagate or die out. When the disease first occurs and no preventive measures are in place, the reproductive potential of the disease is referred to as R0, the basic reproduction rate. The numerical value is the number of cases a single case can cause on average during its infectious period. An R0 above 1 means the disease will likely spread (many influenza viruses have an R0 between 2 and 3, while measles had an R0 value of between 12 and 18), while an R-value of less than 1 indicates a disease will likely die out. Factors contributing to the spread of the disease include the length of time people are contagious, how mobile they are when they are contagious, how the disease spreads (through the air or bodily fluids) and how susceptible the population is. The initial R0, which assumes no inherent immunity, can be decreased through control measures that bring the value either near or below 1, stopping the further spread of the disease.”