DHSS

New Jersey's Active Influenza-like Illness (ILI) Surveillance Statistics
Week of January 15, 2001

Reports were received from 160 schools, with a total population of 125,486 students. The absenteeism rate was 7.02%. This rate is up from 6.42% the week before. In addition to these reports, the Department has received reports of 5 schools this week with absenteeism rates greater than 15%, due primarily to respiratory illness.

Reports were received from 66 nursing homes with a total population of 9,021. The reported influenza-like illness rate was 3.68%, up from 2.75% the week before.

Reports were received from 54 hospital emergency departments. During the 24 hour surveillance period, a total of 5,539 patients were seen, of which 8.14% were being seen because of a respiratory influenza-like illness. This figure was up slightly from 8.00% the week before.

In the past week, there have been an additional 4 viral cultures have been reported; 1 Influenza A from Hackensack Medical Center, 2 Influenza B from McGuire AFB and 1 Influenza A from McGuire AFB. In addition, several physician offices in southern and central New Jersey have reported rapid antigen tests positive for influenza.

Nationwide, since October 1, 74% of influenza specimens typed have been A, and 26% have been B. Of those typed as A, 96% were H1N1 and 4% were H3N2. Of the H1N1, 95% were similar to the A New Caledonia strain that was included in this year's vaccine. The remaining 5% were similar to A Bayern. Although the A Bayern strain is antigenically distinct from the A New Caledonia strain, there is good cross-reactivity between the antibody produced by the A New Caledonia vaccine component and the A Bayern virus, thus this year's vaccine should provide good protection against A Bayern. All H3N2 virus isolated was antigenically similar to the A Panama strain included in this year's vaccine. All influenza B viruses isolated were antigenically similar to B Beijing which was included in this year's vaccine. Thus this year's vaccine is providing good coverage against the virus strains known to be circulating in the United States at this time.

These figures indicate that overall, influenza and influenza-like illness have increased somewhat over the past few weeks, however illness has not become widespread nor has it reached outbreak levels. However, it is reasonable to expect that influenza-like illness will continue to increase in New Jersey in the coming weeks.

Northeastern New Jersey


Schools
% Absent
Nursing Homes
% with ILI
Emergency Departments
% visits with ILI
Bergen6.684.026.10
EssexNRNRNR
Hudson6.792.619.47
Middlesex6.023.8612.02
Monmouth4.011.402.15
Passaic11.492.1110.53
Union7.622.958.23
Regional Total6.543.178.44

Northwestern New Jersey


Schools
% Absent
Nursing Homes
% with ILI
Emergency Departments
% visits with ILI
Hunterdon6.981.953.64
Mercer6.255.381.16
Morris5.771.646.38
Somerset4.463.913.97
Sussex8.915.946.52
Warren9.532.022.42
Regional Total7.452.374.17

Southern New Jersey


Schools
% Absent
Nursing Homes
% with ILI
Emergency Departments
% visits with ILI
Atlantic 6.164.995.96
Burlington9.020.177.46
Camden9.472.3318.56
Cape May7.513.204.30
Cumberland7.392.322.45
Gloucester9.531.758.81
Ocean7.550.007.09
Salem7.245.996.45
Regional Total7.845.128.93
Statewide Total7.023.688.14

NR = no report