A 36 year old male patient has reported to you with swelling in the submandibular region. His tongue is elevated and he complains of dysphagia. He has high fever. Intra oral examination reveals grossly destructed lower first molar.

CST (culture sensitivity test) is carried out to evaluate
Severity of infection
Whether the antibiotic dosage is adequate
Antibiotic is most sensitive or least resistant
To decide when to stop the Antibiotics