Question

WORKSHEET Hemolytic activity Gram Stain Cell Arrangement Blood agar plates: Bacterial Species S. pyogenes E. faecalis S. pneumoniae + + + QUESTIONS 1. List the disease caused by beta-hemolytic streptococci. 2. List the areas of the body where streptococci are indigenous. 3. What types of hemolysis occurred for each of the species of Streptococcus you tested? 4. What types of hemolysis occurred on the blood agar plate containing your throat culture 5. Were you able to identify the type of bacteria you isolated from the throat culture? 6. The Gram stain is useful in distinguishing staphylococci from streptococci; describe the general appearance of each. a. staphylococci- b. streptococci

Answer 1

Bacteria cell arrangenceut s pyogenes ينلهمهمه chains, pairs Pairs S. pneumoniae pairs, short chain Beta - hemolytic streptococci disease are rheumatic fever and glomerulonephritis. 2: 3. Throat, sputum mouth, Nose, vagina, skin, Lower Intestine are the body part where Streptococci are indigenous. Streptococcus pyogenes displays beta hemolysis, Some weakly beta hemolytic species cause intense beta hemolysis. Streptococcus pneumoniae and group of oral streptococci display alpha hemolysis .

4. ß hemolysis 5. Streptococcus pyogenes bacteria can be isolated from the throat culture. 6. a) staphylococci - They are 0.5-2.0 Mm in diameter. They grows in clusters , pairs and occasionally in short chains. Under microscope they appear spherical & grape like clusters. b) streptococcu - round to ovoid in I shape and 0.6-1.0mm in diameter. They grow in pairs or chairs of varying length.