DHSS

New Jersey's Active Influenza-like Illness (ILI) Surveillance Statistics
Week of January 29, 2001

Reports were received from 131 schools, with a total population of 98,494 students. The absenteeism rate was 7.52%. This rate is up from 7.07% the week before.

Reports were received from 58 nursing homes with a total population of 8,269. The reported influenza-like illness rate was 1.95%, down slightly from 2.00% the week before.

Reports were received from 46 hospital emergency departments. During the 24 hour surveillance period, a total of 5,661 patients were seen, of which 10.63% were being seen because of a respiratory influenza-like illness. This figure was up from 9.90% the week before.

In the past week, no new viral cultures positive for influenza have been reported.

Nationwide, since October 1, 73% of influenza specimens typed have been A, and 27% 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.

There continues to be a gradual rise in school absenteeism since mid-November, and within the past two weeks, a greater rise in the percentage of patients being seen in hospital emergency departments with influenza-like respiratory complaints. This is likely to represent an increase in influenza activity in New Jersey, but the apparent activity has not reached outbreak levels. It is reasonable to expect that influenza-like illness will continue to increase in all parts of New Jersey in the coming weeks.

Northeastern New Jersey


Schools
% Absent
Nursing Homes
% with ILI
Emergency Departments
% visits with ILI
Bergen8.452.073.43
Essex6.68NR20.87
Hudson3.76NR10.13
Middlesex5.521.839.72
Monmouth5.241.166.60
Passaic6.682.33NR
UnionNRNRNR

Regional Total5.451.8412.10

Northwestern New Jersey


Schools
% Absent
Nursing Homes
% with ILI
Emergency Departments
% visits with ILI
Hunterdon11.112.683.08
MercerNRNR2.82
Morris6.82NRNR
SomersetNRNRNR
Sussex10.199.908.16
Warren11.281.979.48
Regional Total9.273.235.94

Southern New Jersey


Schools
% Absent
Nursing Homes
% with ILI
Emergency Departments
% visits with ILI
Atlantic 9.112.3210.93
Burlington12.740.00NR
Camden12.210.6712.38
Cape May8.843.16NR
Cumberland7.122.8312.56
Gloucester9.602.7111.49
Ocean9.220.006.97
Salem4.812.547.61
Regional Total9.531.9010.55
Statewide Total7.52.1.9510.63

NR = no report