Microcards are a packet of review flashcards in medical microbiology intended primarily for second year medical students taking a microbiology course and preparing for USMLE Step 1. Features include: coverage of clinically relevant viruses, bacteria, fungi, protozoa, and helminths; a clinical case and annotated picture summarizing the laboratory diagnosis on each card; description of pathobiology from start to finish; grouping of a microorganism's pathobiology into conceptual categories; and accessory cards that highlight concepts common to all microorganisms.