Morphology of Bacteria

Bacterial Sizes, Shapes and Arrangement with Examples

Morphologically bacteria can resemble: Cocci (Singular: coccus) Bacilli (rods) (Singular: rod, bacillus) Vibrios (Singular: vibrio) Spirilla (Singular: spirillum) Spirochaetes (Singular: spirochaete) Cocci These are round or oval bacteria measuring about 0.5–1.0 um in diameter.  When multiplying, cocci may form pairs, chains, or irregular groups: cocci in pairs are called diplococci, e.g. meningococci and gonococci. cocci in chains are called streptococci, …

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25 Differences between Anthrax bacilli and Anthracoid bacilli

Differences between Anthrax bacilli and Anthracoid bacilli

The saprophytic organisms which simulate the anthrax bacillus closely, both in their morphological and cultural characters within the group of Gram-positive aerobic sporing bacilli are termed as Anthracoid bacilli. They have a general resemblance to anthrax bacilli such as producing dry wrinkled colonies and in the smear, appearing as chains of spore-bearing gram-positive bacilli. However, they differ from anthrax bacilli …

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