Northern Fur Sea Lion,
A 22-year-old man presented to an emergency department with a one-day
history of fever, myalgia, chills, headache, and malaise; he did not have
dyspnea or cough.
A 2-year-old girl was taken to the emergency department of a regional
hospital because of a 2-day history of unsteady gait, difficulty standing,
and reluctance to walk.
DNA fingerprints from E. coli O157:H7 isolates.
a Molecular Clock
The origin of HIV.