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.
The IDSA emphasizes that bacteria cause only 2 â 10% of acute sinusitis cases. Viruses, such as those from the common cold, are the main cause of acute sinusitis. Most cases of acute sinusitis resolve on their own within a few weeks.