When we think parasites, we often think of illness, disease, and discomfort. But did you know some of them can actually be helpful? Join Stefan Chin and learn all about them in a fun SciShow compilation all about the world of parasites!

Parasites. They’re all around us, from birds’ nests to litter boxes to our brains, and while plenty of them are harmful to the health of animals like us, some of them can actually be good!

SciShow’s Executive producer Hank Green faces off against SciShow senior editor Alyssa Lerner in this Quiz Show about weird experiments and strange animal parts.

Viruses have a bad reputation -- but some of them could one day save your life, says biotech entrepreneur Alexander Belcredi. In this fascinating talk, he introduces us to phages, naturally-occurring viruses that hunt and kill harmful...

There are tens of thousands of types of worms on our planet, and these wiggly wonders are oh-so fascinating that we had to put together different stories about them to reveal just how 'wormdeful' they are.

Preventing heartworm disease in your dog isn't just good for your furry friend. It turns out that humans can be infected with heartworm, too!

The pee you just flushed without thinking could be a great sample to know what is going on in your body!

Howcast - Learn the symptoms of, treatment for, and ways to prevent the STD syphilis from sexpert Jane Bogart in this Howcast video.

Howcast - Learn the treatment for the STD gonorrhea (The Clap) from sexpert Jane Bogart in this Howcast video.

Viruses and bacteria have their own set of characteristics that distinguish them. But what are those differences? Well, in this video, we will cover the main differences between those 2 groups of microbes.

Scientists have discovered that mast cells, known for causing allergic reactions, may have another use in fighting bacterial infections. Through genetic modification, mast cells were able to break down a poison called endothelin, which...

Prostatitis (Prostate Inflammation) | Different Types, Causes, Signs & Symptoms, Diagnosis, Treatment



Prostatitis is a urologic condition involving inflammation of the prostate gland. There are 4 types of prostatitis, each...

Acute Pyelonephritis (Kidney Infection) | Causes, Pathophysiology, Signs & Symptoms, Diagnosis, Treatment



Acute pyelonephritis is a bacterial infection of the kidney that causes inflammation of the kidney. It is often a...

In this video, I explain how to determine resistance (R) or susceptibility (S) in bacteria using the disk diffusion method (with bacitracin and optochin).

Penicillin: Mechanism of Inhibition of Transpeptidase

Reactive Arthritis & Reiter’s Syndrome | Causes, Signs & Symptoms, Diagnosis, Treatment



Reactive arthritis is a seronegative spondyloarthropathy that occurs after a bacterial infection. It is an immune-mediated condition...

The impact of antibiotics on human health cannot be overstated. They are a big deal. And thanks to evolution, more and more bacteria are becoming resistant to antibiotics. Is there anything we can do? Yes. Let's talk about it.

Common causes of death in ancient Greece and Rome had a lot to do with a lack of modern healthcare and wellness. In an urban society with no central plumbing, impure water supplies that transmitted bacteria, and insufficient medical...

Tropical Sprue | Causes, Pathogenesis, Signs & Symptoms, Diagnosis, Treatment



Tropical Sprue is a gastrointestinal condition of unknown etiology (although likely infectious in nature). It involves malabsorption of nutrients...

Structure of the vagina, uterus, fallopian tubes and ovaries.

Imagine having the ability to manipulate light waves in order to see through a skull right into the brain, or being able to use lasers to diagnose a bacterial infection in a matter of minutes. At the Center for Biophotonic Sensors and...

American singer Madonna was recently rushed to a hospital after she was found unresponsive. The 64-year-old singer caught a bacterial infection and had to be incubated for a night before being put in the ICU for several days. According...

An Ontario mom is warning other parents about Group A strep after the death of her five-year-old daughter. The bacteria causes milder illnesses like strep throat or scarlet fever but can become life-threatening when the infection enters...

Health-care workers are carrying antibiotics to give out after an outbreak of the bacterial infection shigella sent more than 110 people to hospital. The infection causes diarrhea, stomach cramps, vomiting and fever and is spreading...