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Giardia is not amused.

E. coli--part of the normal flora of the human gut. Certain strains of E. coli produce various toxins that cause illness

Giardia smiles back at you. Duodenum has C-shaped/cup-shaped organisms because cut on its side.

SEM image of blood clot

Cancer cell division. Each little bump is a small part of the cell trying to divide again...this is why cancer is "uncontrolled growth"

rotavirus causes severe diarrheal illness in infants and children

HeLa cell dying, colored SEM. This cell appears spherical because it is undergoing apoptosis, or programmed cell death. Apoptosis occurs when a cell becomes old or damaged.

Developing nerve cells...

Image of Streptococcus, a type (genus) of spherical bacteria that can colonize the throat and back of the mouth. Stroptococci often occur in pairs or in chains, as shown here. Tina Carvalho, University of Hawaii at Manoa

Neisseria meningitidis is a Gram-negative diplococcus that is one of the most common causes of bacterial meningitis. Meningitis is an inflammation of the meninges that protect the brain and spinal cord that can be caused by bacteria and viruses. N. meningitidis is a significant cause of morbidity and mortality worldwide.

Primordial Quasar

Goblet cells- they make your mucous.

A diatom chain by Charles Krebbs

Streptococcus Bacteria.

Trypanosoma brucei (African sleeping sickness)

Unwelcome Valentine: Electron micrograph of the disease-causing protozoan Giardia lamblia partway through cell division, forming a heart shape. Public Health Image Library, Dr. Stan Erlandsen

This is your brain on dopamine. Dopamine Neurons. (Source: CELLIMAGELIBRARY.ORG)

Human Nerve Cell

Giardia lamblia protozoa, SEM I picked some of these up on my second trip to India. Not a big fan.

Anything that comes into contact with feces (poop) from infected humans or animals can become contaminated with the Giardia parasite. People become infected when they swallow the parasite. It is not possible to become infected through contact with blood.