PARASITES!

WARM UP

1. Think back to Yesterday’s lesson. Period 3: Lab Report Period 4: HIV Transmission and Immunology.

2. What did you like and dislike about each period?

1. What do you think was the objective of each period?

2. What did you learn from each period?

3. Do you think this information is of value to you personally? Why or why not?

4. Any additional comments or questions. Announcements:3. Hard Copy of Lab Report Due Tomorrow4. Exam Tomorrow

Agenda:5. The wonderful world of parasites6. Study Time

Parasites

What is a parasite or parasitism?• A non mutual relationship between organisms of different

species where the parasite benefits at the expense of the host. • There are many types of parasites!

• Animals – Blood Fluke, Leech, Hookworm, toxoplasma gondii, Candiru• Bacterial - Salmonella• Viral – Ebola, HIV

• Commensalism – one organism benefits. Other is neutral• Mutualism – Both organisms benefit.

Putting Things in Perspective• 1 trillion human cells in the body. • 10 trillion foreign cells living on and in you. (mostly

bacterial)• Making you 1% to 10% human

Parasites on Other Organism

Ampulex compressa – Zombies and NeurosurgerySpecies: Emerald Cockroach Wasp

Type of Parasitism: Egg Laying• Wasp stings venom into cockroach to paralyze cockroach.

Sends second sting to brain and turns it into a zombie. Then, brings roach into burrow and lays eggs into head of cockroach. Larvae hatches and eats cockroach.

2 min in: http://www.youtube.com/watch?v=cyd8NmLJwcM&feature=related

Myrmeconema neotropicum – It likes big butts and it can not lie….

Location: Rain Forest

How it Works: Eggs live and develop in the abdomen of ants and increases. Changes behavior of ants to stick butt in air. Big red butt looks like berries to birds. Parasite breeds inside birds and lays eggs feces of bird.

Human Parasites

Candiru (By Request)Species: Candiru aka Toothpick Fish or Vampire Fish

Location: Amazon river

Size: Up to 16 inches but most are smaller

Fun Facts: • Has been found in vaginal cavity. Extraction by pushing

the hooks in and twisting head off. • Attacks the urethra due to chemical scent of urine

Type of Parasitism: Blood sucking

http://www.youtube.com/watch?v=QQWgUht-ObI

Schistosoma – The sweetest parasite

Species: Schistosoma or Blood Fluke

Location: Asia, Africa, South America

Type of Parasitism: Hooks and feeds off of blood vessels.

Fun Facts:• Have distinct sexual dimorphism: Male and Female• Life Cycle: Eggs passed through urine or feces onto freshwater.

Larvae goes into snail, Larvae then infects mammals by penetrating skin in water. Secretes enzyme to dissolve skin and slips into vein. Swims in circulatory system. Finds a mate. Male does courtship and female fits in groove of male (spooning). Male feeds female and stays together for years…40 years, making eggs.

http://www.youtube.com/watch?v=u05x3fSGKC0&feature=topics

Hookworm – The New Allergy Medicine

Species: HookwormLocation: EverywhereType of Parasitism: Hooks and feeds off of blood vessels. Fun Facts:• Crawls up through the foot. Crawls up host to find intestine and sucks on the

blood. Lays eggs in fecal matter and whole process starts again. Hookworm History: • 1908 Anemia in the South: John D. Rockafeller wanted to find out why the

South’s economy is in the toilet. Economist thought because they were anemic. Sent Doctor down and found that anemia was linked to soil. Good sandy soil = anemia. Hard Clay Soil – no anemia. Checked feces in tree area. Went #2 with no shoes. Scientist set up sandbox to test crawl behavior (1 foot a day). Birth of outhouse 6 ft down

• Jasper Lawrence (England): Hookworm and allergies. Started landscaping business. Saw BBC documentary about parasites and allergies. Looked online and found studies that developing nations don’t have allergies. Wanted to find hookworm. Walked in fecal matter in Africa. (30-40) Went home and no allergies

• Video: http://www.youtube.com/watch?v=44aq2A6NkUw

• http://www.youtube.com/watch?v=44aq2A6NkUw

Toxoplasma – The reason for crazy cat ladies

Species: Toxoplasma Gondii (parasitic protozoa)Location: Cats Type of Parasitism: Invades muscle and neural cells and forms a vacuole to replicate asexually. Can also invade intestines of cats and to reproduce sexually.Fun Facts:• Toxoplasmosis – seizure, blindness• The most amazing feat of mind control

• Toxo hooks up in cat intestine and poos out eggs• Rats eat cat poo and gets toxo• Toxo wants to be in cat so crawls up amygdala of brain (control

center for fear/anxiety) and the part for sexual arousal next door• Toxo makes rats hot for cats but everything else is normal

• Toxo and Schizophrenia and other psychosis• Shows small correlation of increase schizophrenia in late 1700s to

1800s with pet cats• Toxo = 2-4x dying in car accidents • 1 of 1000s of different parasites