Question from Microbiology Advanced 3: Alright, list all of the TORCH microorganisms, giving the letter for each organism as you go and also giving the type of microorganism that each one is. (And please pause) - “T” stands for Toxoplasma gondii and this is a protozoa. “O” stands for six others. These six are in order: Group B Streptococcus, Listeria monocytogenes, E. coli, Treponema pallidum, Parvovirus B19, and HIV. Group B Streptococcus is a gram positive, aerobic, extracellular, cocci. Listeria monocytogenes is a gram positive, aerobic, intracellular, rod. E. coli is a gram negative, aerobic, extracellular, rod. Treponema pallidum is a spirochete. And parvovirus B19 and HIV are both viruses. Parvovirus B19 is a DNA virus, it’s a single strand, linear DNA, icosahedral with no envelop, and HIV is a retrovirus of the Lentivirus genome. It is a single strand, linear, RNA, diploid segmented. It has a complex nucleocapsid and an envelope. The “R” in TORCH stands for Rubella virus. It is a togavirus, rubivirus. Rubella, of course, causes German Measles, or Rubella. It is a single strand, linear RNA, positive sense, icosahedral capsid with an envelope. The “C” in TORCH stands for CMV or Cytomegalovirus. It is a Herpes virus, beta virus and can cause mononucleosis, retinitis or congenital encephalitis. It is a double strand, linear DNA icosahedral capsid with an envelope. And finally, the “H” in TORCH is HSV or Herpes Simplex Virus. It is a Herpes virus, alpha virus, and again is a double strand, linear DNA, icosahedral capsid and envelope.
Posted on: Tue, 01 Jul 2014 20:00:00 +0000
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