There are may different pathogens that cause HAIs. Researchers have studied which of these infectious agents tend to cause infections, how those pathogens are transmitted, and which protocols lead to less contamination. Today we'll explore which pathogens cause hospital-acquired infections, which are the most common, and how long can these pathogens survive on surfaces where they can lead to cross-contamination. Think of it as the three P's: Pathogen, Prevalence, and Persistence.
Today's trio of pathogens are stealthy, living on our bodies without causing us harm but wreaking havoc when they find a way inside a bacteria-free, or sterile part of our body (lungs, bloodstream, internal organs, and others). Typically they are surrounded by other species of bacteria in our intestines or on our skin, using all their energy to battle it out for resources with the other species of bacteria that surround them. This keeps them in check. However, if they are able to enter the sterile parts of our body through an incision or medical device, they find themselves in a new territory with absolutely no competition. With uncontested resources, they quickly reproduce and create an infection which can cause great harm, and even death.
Our blog covers many topics in the healthcare field, most of which focus on preventable hospital-acquired infections. In honor of National Immunization Awareness Month, we focus on a different category of preventable infection, those viral infections that can be avoided thanks to vaccines.
Germ theory, the idea that infection is caused by microscopic organisms unseen to the naked eye, is only a few hundred years old. This theory focuses on three main components.
- The reservoir: The person, animal, or surface that carries the infection.
- The mode of transmission: Via direct contact, a droplet of liquid, airborne, a vector (such as an insect), or a vehicle (food or surface)
- The susceptible host: A person and his/her ports of entry (nose, mouth, incision, medical device, wound)
But the paths from the reservoir to the susceptible host seem infinite. To narrow down the steps needed to prove this relationship between contaminated rooms and infected patients, researchers have proposed routes of transmission that could account for a relationship. Here are two proposals, both of which demonstrate the critical role played by surfaces in the transmission of pathogens.
Today we celebrate the birth of a scientist known as the Father of Microbiology for his role in the use of lenses to observe the microscopic world. Optics and lens-making developed quickly in 16-17th century Europe, allowing research to expand to the universe. But just as lenses could sharpen light from far away, allowing Galileo to see Jupiter's moons, it could also magnify objects right in the laboratory. The microscope was invented by several lens makers at around the same time in the late 1500s and the technology spread throughout Europe. In the 1660s, however, the use of microscopes for intense research grew explosively. Discovery after discovery began to lay the groundwork for modern biology.
An inescapable phenomenon has infected our nation’s population. Within weeks of the first cases, it has spread to millions, leaving victims walking the streets like zombies, eyes glazed over, chasing what appear to be apparitions or hallucinations. On street corners after sunset they gather together in clusters, as-of-yet uninfected onlookers staring in curiosity – and barely concealed horror. What is this virulent pathogen that is ravaging our neighborhoods, our marriages, our workplaces? It’s Pokémon Go.
This phone-based game that has broken records for downloads, profits, and active users happens to be a fascinating analog to the way humans and microorganisms live together. Come along with us as we explore how Pokémon and pathogens meet.
Our last post introduced the work of Louis Pasteur, the father of microbiology. It was not long after Pasteur proposed that microorganisms were to blame for food spoilage that someone would make the leap that infection could, too, also be caused by microorganisms. That man (who would become a great scientific rival to Pasteur) came to be known as the founder of modern bacteriology.
There is really no way to overstate the importance of Girolamo Fracastoro's bold proposal about the roots of infection. His idea that infections were caused by "seeds," living things unseen to the naked eye, was followed by deductions that included the spread of contagion, incubation periods, the organs affected by particular infectious agents, the vulnerable age for a particular disease, the idea that a survivor of an infection is protected against future infections, the ability of a disease to pass from mother to child through nursing, and many other valuable observations. His genius, while respected and supported, was not definitively proven until over 100 years later, with the advent of the microscope.