DTaP[edit] DTaP (also DTPa and TDaP) is a combined vaccine against diphtheria, tetanus, and pertussis, in which the component with lower case 'a' is acellular. This is in contrast to whole-cell, inactivated DTP (aka DTwP). The acellular vaccine uses selected antigens of the pertussis pathogen to induce immunity.
The Battle of Pea Ridge was fought March 7-8, 1862, and was an early engagement of the American Civil War (1861-1865). Armies & Commanders: Battle of Pea Ridge - Background: In the wake of the disaster at Wilson's Creek in August 1861, Union forces in Missouri were reorganized into the Army of the Southwest. Numbering around 10,500, this command was given to Brigadier General Samuel R. Curtis with orders to push the Confederates out of the state.
Union troops held their position, and the Battle of Gettysburg continued for one more fateful day. On July 3, 1863, Confederate troops attacked the center of the Union line on Cemetery Ridge. After a cannonade raged for about two hours, Gen. Robert E. Lee ordered his Confederate infantry to attack.