Bacilli

Bacilli is a class of bacteria. All species in this class are Gram-positive.

Classification

Domain : Prokaryota, Bacteria

Kingdom : Bacteria 

Phylum : Firmicutes 

Class : Bacilli

 

Pathology

Order : Bacillales (Gram-positive)

Family : Bacillaceae

• Bacillus anthracis : Anthrax
• Bacillus cereus : Food poisoning

Family : Listeriaceae

• Listeria monocytogenes : Listeriosis

Family : Staphylococcaceae

• Staphylococcus aureus : Impetigo, wound infections, UTIs, 
• Staphylococcus saprophyticus : UTIs,  

 

Order : Lactobacillales (Gram-positive)

Family: Enterococcaceae

• Enterococcus species : UTIs,  

Family : Streptococcaceae

• Streptococcus anginosus 
• Streptococcus agalactiae 
• Streptococcus bovis  
• Streptococcus dysgalactiae 
• Streptococcus pneumoniae : Community-acquired pneumonia, meningitis
• Streptococcus pyogenes : Impetigo, rheumatic fever

 

Streptococcus: Group A vs Group B 

Group A Streptococcus species

• Streptococcus anginosus
• Streptococcus dysgalactiae  
• Streptococcus pyogenes

GAS can cause:

• Bacteraemia
• Erysipelas
• Glomerulonephritis
• Scarlet fever
• Streptococcal pharyngitis 
• Streptococcal toxic shock syndrome
• Necrotising fasciitis
• Pneumonia 

 

Group B Streptococcus species

• Streptococcus agalactiae

GBS can cause:

• Chorioamnionitis
• Postpartum infections
• GBS urinary tract infections (UTIs). UTIs may induce labour and cause premature delivery and miscarriage.
• Neonatal septicemia
• Neonatal pneumonia
• Neonatal meningitis