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Showing posts with label Epidemiology. Show all posts
Showing posts with label Epidemiology. Show all posts

Friday, November 19, 2010

Mosquitoes, Annoying As Hell and Saving Lives!

Using Mosquitoes to Stop Mosquitoes: The Awesomeness of GMOs

Image Credit: Alvesgaspar, Wikipedia commons. Creative Commons Attribution 3.0

As I walked to school today through piles of snow on the side of the road and sidewalk I was reminded of just one of the wonderful things about winter: there are absolutely none of those little bloodsuckers known as 'mosquitoes'. Not only do you have to deal with persistent whining next to your ear and an itch that won't quit no matter how much you scratch, mosquitoes are flying little hypodermic needles some of which are filled with pathogens that unbelievably may exceed the harm done by incessant biting.

Thursday, November 11, 2010

New NDM-1 Positive Super Bacteria On the Rise

The growing spread of multi-drug resistant pathogens has many people fearing potential epidemics


Posted by Alexandru Nicolae


It all started when a Swedish-Indian citizen traveled to India for a simple visit. In New Delhi, she developed a urinary tract infection by an antibiotic-resistant pathogen called Klebsiella pneumoniae. This new strain was resistant to a specific type of powerful antibiotic called carbapenem, a drug used as a last resort in fighting especially drug-resistant infections. As of November, 2010, many other forms of bacteria including strains of E-coli have been found to possess the same resistance, and they've appeared in places around the world. As of this date, 8 cases have been reported in Toronto, Canada (a long way from India indeed). How exactly are these bacteria foiling our greatest weapons against them?

Sunday, October 24, 2010

The Haiti cholera outbreak and why we should be remembering Dr. John Snow.

The recent tragedy of the cholera outbreak in Haiti had gotten me thinking about water sanitation in the west and how much we take it for granted. It also got me thinking about one of the great founders of epidemiology, Dr. John Snow, a physician living in 19th century London.

Snow was famous for having done extensive research on anesthesia, primarily chloroform and ether (lovely smelling chemical by the way, reminds me of a dentist's office). He was also physically present and administering chloroform as a method of obstetrical anesthesia to good old Queen Victoria as she was pumping out two of her nine kids.

His greatest achievement, however was in founding the science of epidemiology. He did this through the study of a cholera outbreak that occurred in 1854 in a small town called Soho. He essentially got a map of the town and began visiting and interviewing as many people he could talk to about their health., their lifestyle habits etc. Through extensive probing, he discovered that all the towns folk who contracted cholera did so after drinking or bathing in water from one specific well: the Broad street pump. He eventually convinced those using the well to stop, and the cholera cases soon disappeared. Because of his proper mapping of the town's citizens who were affected by the disease, Snow was able to construct one of the first epidemiological maps, which again showed the cases of disease spread around the Broad street pump. It was later discovered that the pump was dug several feet away from an open sewage pit, with fecal matter entering the water supply.

His work not only founded an entire branch of science, but also helped solidify a link between contaminated water and disease. If you ask me, that's one of the finest discoveries of science that we take for granted every day.

Most of the world's population who are still affected by diarrheal diseases nowadays are from developing countries like Haiti, and the majority of those victims are children, the ones who can tolerate it the least. I once caught viral gastroenteritis: non stop vomiting and ...well, you know, the "other" thing. The treatment ended up being bed rest and some diluted gatorade, and I even complained about that. To image that many of these people may die from something similar either makes one feel really depressed or really lucky. Maybe it's a bit of both.