inflammation of frontal and maxillary sinuses and close-up view of staphylococci bacteria

maxillary sinus frontal sinusitis frontitis staphylococcus antrum highmore paranasal illustration respiratory anatomy human mrsa staphylococci microbial prevention science nose acute treatment bacterial medical inflammation allergic pain sickness cavity closeup disease anatomical nasal adult healthy health sick infection cold illness medicine bacteria headache chronic microbe macro rhinosinusitis cocci coccus spherical hospital acquired