01:146:328 Lecture 2: Lecture 2_ Parasitology
17 Jan 2019
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The host is an environment: advantages: constant conditions, we are dealing with constant fluctuation, but in a host, the conditions stay the same (ph, temperature, problem: the host will die. Lecture 2: sexual transmission, without exposure to external environment to parasite does not need specialized transmission stage, example: vaginals protozoan, vertical transmission. Infection of developing egg or embryo while still in mother"s body or at time birth/egg laying: new generation (offspring) is already infected with parasite, example: toxoplasma gondii. Introduction to trematodes (helminths: tree of life, phylum platyhelminthes, flatworms, bilateral symmetry. Acoelomate: lack a body cavity: class trematoda. Lecture 2: subclass digenea (1) at least 2 host in life cycle (2) always snail first intermediate hosts (3) flukes. Lecture 2: glands, germinal cells, miracidial behavior, host-finding (1) respond to environmental cues (a) toward (+) or away from (-) (i) Keeping miracidium in snail active space and increases likelihood of finding host b)
