*Viral culture, DFA, and PCR performed in nasopharyngeal specimens. PCR performed in lung tissue. ‡Classic triad: myalgias, muscle weakness, and dark urine. ARF: acute renal failure; CPK: creatine phosphokinase; DFA: direct immune-fluorescence antibody assay; N/A: not available; PCR: polymerase-chain reaction; Ref.: reference; y: years.