Which side was more affected by illnesses during the civil war?

During the Civil War, the Union was more affected by illnesses than the Confederacy. While both sides faced significant health crises, the Union's larger troop numbers and mobilization led to higher overall rates of disease. Poor sanitation, inadequate medical care, and the spread of Infectious Diseases like dysentery and pneumonia contributed to high mortality rates among Union soldiers. The Confederacy also struggled with illness, but its smaller army and resources meant that the impact was felt differently.