Home Products Most Popular Contact
No items in your cart.
The page below is a sample from the LabCE course Reading Gram Stained Smears From Cultures. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

Learn more about Reading Gram Stained Smears From Cultures (online CE course) »
How to Subscribe
MLS & MLT Comprehensive CE Package
Includes 123 CE courses, most popular
$95 Add to cart
Pick Your Courses
Up to 8 CE hours
$50 Add to cart
Individual course$20 Add to cart

S. pneumoniae on direct Gram stain

S. pneumoniae recovered from media

Variations in the Shape of Cocci

Cocci are true spheres. However, some cocci will appear slightly oval in shape, while others may be lancet-shaped as shown in the illustrations below. As previously discussed, the colony morphology demonstrated from colonies growing on an agar surface can be less characteristic than direct smears or those grown in broth. On direct smears, Streptococcus pneumoniae typically demonstrates lancet-shaped cocci as shown in the top image on the right. The lower image on the right is a Gram stain of S. pneumoniae recovered from a blood agar plate (BAP).
Slightly oval-shaped cocci
Lancet-shaped cocci