Final answer:
A patient with symptoms and travel history consistent with trichinosis is likely to be diagnosed with trichinellosis and treated with albendazole, supplemented by steroids if needed to reduce muscle inflammation.The correct option is A.
Step-by-step explanation:
The patient presenting with symptoms such as myositis, fever, subungual splinter hemorrhages, periorbital edema, and eosinophilia, and with a recent travel history to Mexico, is most likely suffering from trichinosis (also known as trichinellosis), which is caused by Trichinella spiralis. Diagnosis of trichinosis involves clinical history, muscle biopsy to detect larvae, and serological testing like enzyme immunoassays. As for treatment, medications such as albendazole and mebendazole are effective in killing adult worms in the intestine, and steroids may be administered to reduce inflammation due to larvae in the muscles. The connection between muscle symptoms and travel to areas where trichinosis is endemic point towards this diagnosis.