Category: Protozoa

Crying Wolf: Texan Dogs Used as Sentinels for Chagas Disease

By Rebecca Kreston | July 29, 2014 8:00 pm

In the twentieth century, men toiling in British and American coal mines relied on a primitive alert system for imperceptible dangers: the bright canary bird. Miners toted the caged birds into the depths of the earth to serve as early warnings against poisonous and potentially fatal gas leaks. If the tiny birds suddenly slumped in their cages due to the presence of odorless and colorless carbon monoxide, miners would beat a hasty retreat to safer, cleaner air.

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Pyromania! On Neurosyphilis and Fighting Fire with Fire

By Rebecca Kreston | May 31, 2014 11:20 am

Medicine is an imperfect science, its history shot through with barbaric and dubious practices from grave robbing to bloodletting. Since even before the time of that father of modern medicine, it can seem that physicians have more often violated Hippocrates’ decree “above all, do no harm” than abided by it.

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Microbial Misadventures: Playing With Fire

By Rebecca Kreston | May 26, 2014 11:00 am

“Water-borne pathogen.” Three gut-twisting words with enough power to make any epidemiologist, public health official, or globetrotting tourist double over. One of the most common forms of disease transmission is the microbial hijacking of our most precious fluid. This mechanism of infection is employed by a motley crew of microscopic organisms that have adapted to prey upon our unquenchable thirst, from pervasive bacteria like cholera and typhoid to often less famous but no less formidable parasites such as giardia and dracunculiasis.

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Microbial Misadventures: A Malaria Outbreak Without Mosquitoes

By Rebecca Kreston | April 14, 2014 9:07 am

Microbial Misadventures is a recurring series on Body Horrors looking at instances and incidents where human meets microbe in novel and unusual circumstances that challenge our assumptions about how infections are spread. 

Shout “fire” in a crowded room and watch the occupants fly for the exits. Speak the word “malaria” and watch as all within earshot reach for the nearest can of DEET.  The incontrovertible fact of malaria’s relationship with mosquitos is one that has been known since Sir Ronald Ross discovered the parasite nesting within the belly of a mosquito in 1897. Such is the natural order, an incontestable necessity of the protozoan parasite’s life cycle. Humans, however, are rather adept at bucking that system – see cronuts, labradoodles, and the college bowl ranking system for examples. Also due to the interference of mankind, as a 1995 Taiwanese medical mystery proved, malaria can indeed be spread without the assistance of their obnoxious arthropod cronies.

A photomicrograph of Plasmodium malariae showing the merozoite stage of the parasite’s life cycle. These red blood cells will release merozoite that will eventually develop into male and female gametocytes. Image: CDC.

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Congo’s Uncharted Territory

By Rebecca Kreston | August 19, 2013 7:51 pm

The Democratic Republic of Congo is home to one of the largest and most biologically diverse rain forests in the world, featuring an incredible variety of animals including bonobos, forest elephants, and mountain gorillas. The country is also the stomping ground of a staggering array of microbial organisms and the region is well known as a wellspring of novel human pathogens, some with big household names and others little known. Some of these diseases, such as HIV/AIDS, have emerged as recognizably major pandemics; others, such as Ebola virus, have been limited to small, localized outbreaks; others still, such as the mosquito-borne Chikungunya virus, pose the risk of becoming new threats to global health.

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Coming to America: Neglected Tropical Diseases Are Here (To Stay?)

By Rebecca Kreston | June 1, 2013 6:11 pm

Parasites and viruses once thought to make their homes exclusively in exotic locales beyond America’s borders are now gaining a foothold in the country and they are exacting significant economic tolls and placing heavy burdens on health care systems. Neglected tropical diseases such as cysticercosis, echinococcus, toxocariasis, dengue, West Nile virus and Chagas have found their way into the country due to a synergistic combination of factors, including globalization, migration, trade and climate change.

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Suck It: The Ins and Outs of Mouth Pipetting

By Rebecca Kreston | March 20, 2013 12:15 pm

If you ever find yourself working in an infectious disease laboratory, whether it’s of the diagnostic or research variety, the overarching goal is not to put any microbes in your eye, an open wound or your mouth. Easy enough, right? Wear gloves, maybe goggles, work in fume hoods and don’t mouth pipette. When working with pathogenic bacteria and viruses, priority number one is Do Not Self-Inoculate.

Former Centers for Disease Control (CDC) parasitologist, Dr. Mae Melvin (Lt), examines a collection of test tubes while her laboratory assistant mouth pipettes a culture to be added to these test tubes. Source: David Senser/CDC.

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Nobel Prizes, Tropical Medicine & One Nazi Sympathizer

By Rebecca Kreston | March 21, 2012 2:41 pm

Nobel Prizes! We all want one, don’t we? While fantasizing about heavy gold medallions and the Swedish Nobel Assembly, I wondered how many of the Nobel Laureate prizes in Physiology and/or Medicine have gone towards scientists studying infectious diseases, immunology and the tropical medicine field. Snooze button alert, am I right? This is the product of a one-track mind so you have my apologies. But! If it’s any consolation, there’s a story hidden in this article of a Nobel Laureate Nazi sympathizer that infected mental patients with malaria to cure them of their psychoses.

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Behind Enemy Lines: Cutaneous Leishmaniasis in Returning US Troops from the Middle East

By Rebecca Kreston | November 4, 2011 1:25 pm

The Soviet invasion of Afghanistan from 1979 to 1988, by all accounts, did not go as well as they had anticipated. The locals were unsupportive of their efforts against the Mujahideen, the notoriously craggy terrain regularly chewed through soldiers’ boots, the Soviet army was frequently unable to provide suitable equipment, food and water to its own troops, and so on.

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Consider the Carpaccio: Looking at Toxoplasmosis

By Rebecca Kreston | April 28, 2011 11:38 pm

A parasite that infects the human brain, subtly changing its personality and social behavior, and capable of passing from mother to infect an infant in utero? That is the essence of a body horror, but this little rascal isn’t fiction. And it gets better: this parasite is considered to be one of the most successful parasites in the world due to its widespread, global distribution as well as its capacity to infect nearly every type of body tissue in all warm-blooded vertebrates (a). Schedule a phone conference with Spielberg and Cruise ASAP, guys, we’ve got the next sci-fi-action blockbuster on our hands (brains?). We’re looking at the ubiquitous protozoa Toxoplasma gondii and research on its capacity to modulate human personality and behavior.

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