Sanitary microbiology

3. During a sanitary-bacteriological tap water investigation the following results were obtained: the total amount of bacteria in 1.0 ml is 80, coli index is 3. How should the results of the investigation be evaluated?

Quality of water is doubtful.

*Water is eligible for drinking

Quality of water is very doubtful

Water is polluted.

E. Water is considerably polluted.

b-12 Sanitary-bacteriological investigation of water by the method of membranous filters detects two red colonies on a membranous filter (Endo medium), through which 500 ml of the explored water has been passed. What are the coli index and coli titer of the explored water?

A. *4 and 250.

B. 2 and 500.

C. 250 and 4.

D. 500 and 2.

E. 250 and 2.

Coli-index is an amount of E.coli per 1000 ml of investigated water

Coli-titer is a volume of water (ml) including 1 cell of E.coli

36. Sanitary-bacteriological water research is carried out to assess drinking water eligibility. What numerical symbol characterizes the amount of E.coli per one liter?

Perfringens titer.

B. Coli titer.

Coli phage titer.

*Coli index

Total microbial amount.

60. Sanitary-microbiologic drinking water research is being carried out in a bacteriological laboratory. Total microbial amount appeared to be nearly 100. What microorganisms were taken into account?

A.Enteropathogenic bacteria and viruses.

B. Coliform bacteria.

C. Pathogenic for people and animals bacteria.

D.Opportunistic microorganisms.

E. *All bacteria, which have grown on nutrient medium.

61. Microbial amount of air in a hospital room appeared to be 1500 cells/m³. What groups of microorganisms were taken into consideration?

A. Bacteria and viruses — causative agents of respiratory infections.

B. * All bacteria, which have grown in nutrient medium.

C. Staphylococci and streptococci.

D. Hospital infection causative agents.

E. All pathogenic and opportunistic bacteria.

*b-12 At usual control of the sanitary- bacteriological state of the chemist department (pharmacia) bacteriological investigation of air has been made. There were bacilli, yeast-like fungi, hemolytic streptococci, and micrococci in it. Which kind of revealed microorganisms indicates the direct epidemic hazard?

Micrococci

*Streptococci

bacilli

Yeast-like fungi

*For sanitary state assessment of maternity hospital the investigation of air into delivery room, new born department, and other rooms has been made with Krotov’s apparatus (aspiration technique). Which microorganism indicates hazard epidemic situation in maternity hospital?

Micrococci

Escherichia coli

*Pathogenic staphylococci

Lactic acid bacteria

Bifidumbacteria

During air control of operative theatre before surgery next results have been obtained: 356 colonies have grown onto the MPA, and 6 golden colonies with clear zone of hemolysis onto the blood agar. Are these normal data for air or not?

Corresponds to normal data

Corresponds to temperate contamination

*Contaminated with golden Staphylococcus (S.aureus)

It is difficult to estimate result

Contaminated with fungi

*At sanitary-bacteriological investigation of the meat products (boiled sausage, after customer request) a seeding onto special nutrient media has been made (Endo agar, MPA, Wilson-Bluer agar). After 2 days more then 250 colonies were revealed onto MPA, 45 ones – onto Endo, and 3 ones onto WB agar. How can you estimate freshness and quality of this product ?

*High contaminated, ineligible for usage

Pure, normal

Temperate contaminated, normal

Contaminated with E.coli, normal

Contaminated with clostridia, ineligible for usage