Medical parasitology is the relationship between humans and the organisms that live in them.
- Unlike many bacterial and viral infections, parastic information are often chronic and could last till several years. repeated exposures would result in ever-increasing parasite burden.
- Many infectious diseases can cause by endogenous organsims which are transmitted through oral ingestion, direct penetration through skin or other surfaces and bites of arthropod vectors.
- Arthropoda comprises invertebrate animals.
- Metamorphosis is a process whereby arthropods deveop from an egg to an adult.
- Arthropods are divded into 2 catogeories; Chilopoda, Pentastomida, Crustacea, Arachnida and Insecta.
- Two examples of arachnida are Scorpions and Ticks.
- Another two examples of insecta (hecapods; which constitute the largest and most important of all the classes of arthro) are stinging insects and bugs.
- Are known as roundworms and are members of the phylum Aschelminthes and the class Nematoda.
- Cylindrical in shape and covered by a tough outer covering (cuticle).
- Most of the time, the ova and larvae would be found in feces.
- Embryos of nematode eggs would be developed if left in room temperature.
- Intestinal nematodes which infect humans usually have direct lifecycles.
- Most of the time transferred from person-to-person with no intermediate host needed.
- Lifecycles comprises of 4 larval stages with 1 adult stage.
Members of the phylum Platyhelminthes.
Humans can be infected by either the larvae of the adult forms.