Malaria chemoprophylaxis — first-line regimens — MEDICAL

Objectives

Identify the key rules and §§ that apply to malaria chemoprophylaxis — first-line regimens.
Apply the USMLE.Step1.InfectiousDiseases.Malaria knowledge element in a typical exam scenario.
Recognize common distractors and partial-credit answers.

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Atovaquone-proguanil, doxycycline, and mefloquine are preferred first-line agents for most regions where chloroquine resistance is present. Atovaquone-proguanil is taken 1–2 days before entry through 7 days after departure; doxycycline 1–2 days before through 28 days after; mefloquine ≥2 weeks before through 4 weeks after. Primaquine has a role against P. vivax / P. ovale when G6PD status has been confirmed.

Check yourself

3 quick questions — no score kept, just formative feedback.

Q1 · USMLE.Step1.CV
A 62-year-old has chest pain radiating to the jaw and ST elevations in leads V2-V5. Door-to-balloon time guideline for primary PCI per ACC/AHA STEMI guidelines is:

Answer choices A Within 30 minutes. B Within 90 minutes. C Within 3 hours. D Within 12 hours.
Q2 · USMLE.Step1.Micro
Per the CDC Pink Book, which vaccine is LIVE-ATTENUATED and contraindicated in pregnancy and severe immunocompromise?

Answer choices A Inactivated polio vaccine (IPV). B Measles-Mumps-Rubella (MMR). C Hepatitis B. D Tdap.
Q3 · USMLE.Step1.Renal
A patient with severe hyperkalemia (K+ 7.2) and peaked T waves on ECG. The first intervention to stabilize the cardiac membrane is:

Answer choices A IV insulin with dextrose. B Nebulized albuterol. C IV calcium gluconate. D Oral sodium polystyrene sulfonate.

Ask questions about this passage. Answers cite the specific corpus chunk and regulation. The tutor will never reproduce real exam items.

Objectives

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