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U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet): Overall Percentage of Visits for ILI

Updated May 1, 2020

U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet): Overall Percentage of Visits for ILI
September 29, 2019 – April 25, 2020
Data as of April 30, 2020
National (Baseline: 2.4%)
CDC Week # Sites Reporting ILI 0-4 years ILI 5-24 years ILI 25-49 years ILI 50-64 years ILI 65 years and older Total ILI Total Patient Visits % Unweighted ILI % Weighted ILI
201940 2,912 6,240 7,679 4,824 1,773 1,445 21,961 1,460,252 1.5 1.5
201941 2,943 6,573 7,638 5,146 2,022 1,601 22,980 1,438,727 1.6 1.6
201942 2,967 7,304 8,295 5,551 2,115 1,647 24,912 1,432,866 1.7 1.7
201943 2,997 7,894 9,365 6,075 2,310 1,794 27,438 1,475,426 1.9 1.8
201944 3,007 8,678 10,060 6,134 2,284 1,758 28,914 1,437,828 2.0 2.0
201945 3,022 10,561 12,501 7,161 2,464 1,839 34,526 1,464,803 2.4 2.4
201946 2,990 11,424 13,533 7,853 2,743 1,965 37,518 1,428,594 2.6 2.6
201947 2,985 12,659 16,865 9,062 3,103 2,135 43,824 1,486,555 2.9 2.9
201948 2,994 14,363 14,668 9,114 3,206 2,358 43,709 1,277,390 3.4 3.4
201949 2,994 13,795 16,274 11,860 3,940 2,774 48,643 1,477,763 3.3 3.3
201950 2,956 14,672 21,791 12,775 4,135 2,899 56,272 1,460,141 3.9 3.9
201951 2,926 17,992 29,109 16,221 4,846 3,348 71,516 1,426,142 5.0 5.1
201952 2,916 24,051 33,940 24,585 7,660 5,399 95,635 1,340,575 7.1 7.1
202001 2,962 21,581 23,397 27,628 9,229 6,862 88,697 1,427,075 6.2 5.9
202002 2,990 15,514 22,679 23,546 8,195 5,448 75,382 1,488,663 5.1 4.9
202003 2,982 16,491 29,530 21,342 7,373 4,724 79,460 1,484,964 5.4 5.3
202004 2,982 18,481 35,139 23,529 7,959 4,646 89,754 1,493,313 6.0 6.1
202005 2,975 20,169 43,898 28,696 9,508 5,439 107,710 1,567,095 6.9 6.7
202006 2,984 20,113 45,317 29,686 10,027 5,655 110,798 1,564,026 7.1 6.8
202007 2,947 17,230 36,699 26,250 9,199 5,407 94,785 1,524,153 6.2 6.1
202008 2,959 15,172 28,317 23,004 8,300 5,147 79,940 1,423,133 5.6 5.5
202009 2,911 13,631 25,220 21,889 8,245 5,047 74,032 1,450,853 5.1 5.1
202010 2,874 13,674 26,149 23,636 8,850 5,625 77,934 1,473,063 5.3 5.3
202011 2,796 13,914 27,499 29,447 11,288 6,636 88,784 1,401,441 6.3 5.7
202012 2,746 10,655 17,380 30,691 12,463 6,942 78,131 1,051,263 7.4 6.5
202013 2,651 5,092 8,329 22,422 10,864 6,431 53,138 837,618 6.3 5.1
202014 2,598 2,339 4,822 14,885 8,664 5,351 36,061 733,509 4.9 3.8
202015 2,579 1,444 3,368 9,916 6,011 3,983 24,722 697,249 3.5 2.8
202016 2,536 1,016 2,590 7,339 4,156 2,894 17,995 682,556 2.6 2.2
202017 2,403 869 2,240 6,245 3,228 2,259 14,841 699,674 2.1 1.8
Totals 1,750,012 39,606,710

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