BIOL 4376 Lecture Notes - Lecture 16: Macconkey Agar, Shiga Toxin, Enterobacteriaceae
3 Jul 2020
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Part of the intestinal tract, female genital tract. These are nonmotile most others are motile. Contains antibiotics which prevent the growth of gram positive bacteria. If the bacteria is lactose-fermenting, the agar turns bright pink. If the bacteria is not lactose-fermenting (glucose only), the agar stays yellowish. Lactose-fermenting species e. coli, klebsiella, enterobacter species. All enterobacteriacae have lipopolysaccharide endotoxins cause fever, leukopenia. Symptoms: frequent urination, urgency of urination, burning on urination, blood in urine, white blood cells in urine, fever, pain in lower-middle back. Strain o157:h7 produces shiga toxins (causes diarrhea) Highly communicable less than 100 bacteria can cause infection in humans. Rapid multiplication within 12 hours or less *test question on ranking virulence. Shigellosis shiga mucus/blood/pus, symptoms subside in 2-5 days toxin, abdominal pain, watery diarrhea, stools with. Motile organism, does not ferment lactose, produces hydrogen sulfide. Symptoms: high spleen/liver, low white blood cell count fever, malaise, headache, bradycardia, enlarged. Most common salmonella infection, peaks in summer months.
