
When we think about personal injury, we often think about external factors: a wet floor, a distracted driver, or a faulty piece of equipment. However, an often-overlooked part of the equation is the unique vulnerability of the individual involved. Are certain people more susceptible to injury? Science and the law both say yes.
From pre-existing physical conditions to hidden infections like Toxoplasmosis, understanding these vulnerabilities is the first step toward safety and, if an accident occurs, securing justice.
The Science of “Latent” Risk: The Toxoplasmosis Connection
It sounds like a headline from a science fiction novel: Can your pet cat make you more likely to get into a car accident? While that is an oversimplification, recent scientific studies have found a startling correlation between latent toxoplasmosis and increased traffic accidents.
Toxoplasmosis is a condition caused by the Toxoplasma gondii parasite. While it is often associated with cat feces, it can also be contracted through undercooked meat or contaminated water. In healthy adults, the infection is often “latent”, it stays in the body without making you feel “sick.”
However, research has shown that this parasite can affect the brain and nervous system in subtle ways:
- Impaired Reaction Times: Studies have found that people with latent toxoplasmosis have significantly slower reaction times than those who are uninfected.
- Increased Risk-Taking: There is evidence suggesting the parasite may alter personality traits, potentially leading to increased activity and decreased fear.
- The Accident Link: Data from traffic accident victims indicates that those infected with the parasite are up to 2.65 times more likely to be involved in a crash.

Physical Vulnerability and the “Eggshell Skull” Rule
Beyond internal infections, many people live with physical disabilities or pre-existing injuries that make them more “medically fragile.” You might wonder: If I was already injured, can I still file a claim if a new accident makes it worse?
In the legal world, we use a concept called the “Eggshell Skull” Doctrine. This rule states that a negligent party is responsible for the full extent of the damages they cause, even if the victim was more susceptible to injury than an average person.
For example:
- Pre-existing Back Injuries: A minor fender-bender might cause a healthy person a few days of soreness, but for someone with a herniated disc, it could lead to permanent disability.
- Physical Disabilities: Someone using a walker or wheelchair may not be able to react as quickly to avoid a slip-and-fall hazard.
- Age: Older adults may have more brittle bones, making a fall on a poorly maintained sidewalk far more catastrophic.
Under the law, your pre-existing condition does not disqualify you from seeking compensation. In fact, it highlights why the negligent party must be held accountable for the specific harm they caused you.
How Koonz McKenney Johnson & DePaolis LLP Can Help

If you have been injured, the road to recovery can feel overwhelming, especially if you are dealing with a pre-existing condition or a complex medical history.
Resources for Victims:
- Medical Documentation: The first step is always a thorough medical evaluation. Proving how an accident exacerbated a previous injury requires expert medical testimony.
- Legal Guidance: Insurance companies often try to use your “prior” health issues as an excuse to lower your settlement. You need an advocate who understands the “Eggshell Skull” rule and can fight back.
- Comprehensive Support: At Koonz McKenney Johnson & DePaolis LLP, we have recovered over $1 billion for victims in DC, Maryland, and Virginia. We work on a contingency fee basis which means you pay nothing unless we win.
Whether your accident was influenced by a hidden health factor or you are struggling with the worsening of a lifelong disability, you are not alone. Our team is dedicated to protecting the rights of the most vulnerable members of our community.
Contact us today for a free consultation and let us help you find the path forward.
