Suppose you got a sputum sample from a patient suspected of

Solution

Sputum is non sterile it has normal flora and pathogenic bacteria.

If sputum gives six types different types of colonies.

Next test will Gram test to find out wheather any colonies are Gram positive, as Streptococcus pneumoniae is Gram positive bacteria.

Further there many biochemical and immunological test to identify pneumonia causing bacteria.