NEW ORLEANS — The Louisiana death toll from the coronavirus pandemic rose Sunday but the rate of infection appeared to have slowed dramatically, according to figures released by the Louisiana Department of Health. The state had a total of 3,540 confirmed cases as of noon CDT Sunday, compared to 3,315 on March 28. That increase of 225 cases, or less than 7%, marks a dramatic flattening of the curve Louisiana had experienced last week, when the percentage rise was as high as 28% on some days.