Final answer:
The best first test for a 7-year-old with symptoms of strep throat is a rapid antigen detection test, followed by a throat culture if suspicion remains after a negative test. Treatment includes antibiotics and symptomatic relief to prevent complications and shorten illness duration.
Step-by-step explanation:
A 7-year-old with exudative pharyngitis, tender cervical lymph nodes, and a fever of 102°F could be exhibiting signs of a Group A Streptococcal pharyngitis or strep throat. The best first test to diagnose this condition is a rapid antigen detection test (RADT) due to its quick results, although it has a risk of false negatives. If the RADT is negative but clinical suspicion remains high, a throat culture is the next best step. This is considered the gold standard for diagnosis despite taking longer for results. Treatment includes antibiotics, such as oral amoxicillin or intramuscular penicillin G, to prevent complications like rheumatic fever and to speed up recovery. A second aspect of treatment is symptomatic relief, including fever reducers or pain relievers such as acetaminophen or ibuprofen. Treating strep throat is essential to prevent potential complications and to shorten the duration of illness.