Pneumococcus (Morphology & Pathogenesis)
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Streptococcus pneumoniae is a gram-positive bacterium that is small, arranged in pairs, and encapsulated. It is a common cause of pneumonia and meningitis. Pneumonia caused by S. pneumoniae can be lobar or bronchopneumonia. Lobar pneumonia typically results from lowered general resistance and involves certain serotypes. Bronchopneumonia is always a secondary infection following a viral respiratory infection and can involve any serotype. Meningitis is a serious infection more common in children. S. pneumoniae can also cause other infections like empyema, sinusitis, and conjunctivitis as complications of pneumonia.
Pneumococcus (Morphology & Pathogenesis)
- 1. Streptococcus pneumonia •Morphology •Pathogenesis Sathar Shareef Abuzar (BDS)-2017 Dr.NTR University of Health Sciences Andhra Pradesh
- 2. Morphology: • Gram Positive • Small in Size and Arranged in Pairs • They have two ends. One end is Rounded and other is Pointed • They are Capsulated (Polysaccharide Capsule) which Encloses each pair • Non-Motile and Non-Sporing
- 4. Pathogenesis: • Most Common Bacterial causing pneumonia, both Labor and Bronchopneumonia. 1. Labor Pneumonia: • Results only when the General Resistance is Lowered. • Common infective type include Type 1-12 in adults. Type 6,14,19&23 in Children.
- 5. 2.Bronchopneumonia: • Always a Secondary infection following viral infections of Respiratory Tract • Any Serotype of Pneumococcus can produce Bronchopneumonia 3. Meningitis: • It is the most serious of Pneumococcal infections. • It is more commoner in Children 4. Other Infections: • Pneumococcus may produce emphysema, Sinusitis, Conjunctivitis, Suppurative arthritis, usually as a complications of pneumonia