chemical formula a combination of symbols used to express the chemical components of a substance. empirical formula a chemical formula that expresses the proportions of the elements present in a substance.
The bacteria streptococcus pneumoniae is the most common cause of acute bacterial sinusitis. This type of bacteria can be resistant to the most common types of antibiotics at standard dosages, although there are other antibiotics that can be used to treat the condition.
Sinusitis is a bacterial infection or inflammation of one or more of the sinus passages located in the bones surrounding the eyes and nose. It could be caused by a cold, flu, tonsillitis, allergies or poor mouth hygiene.