DHSS

New Jersey's Active Influenza-like Illness (ILI) Surveillance Statistics
Week of February 19, 2001

Reports were received from 133 schools, with a total population of 110,413 students. The absenteeism rate was 6.37%. This rate is up slightly from 6.06% the week before.

Reports were received from 63 nursing homes with a total population of 8,996. The reported influenza-like illness rate was 2.01%, down from 2.44% the week before.

Reports were received from 51 hospital emergency departments. During the 24 hour surveillance period, a total of 5,365 patients were seen, of which 7.16% were being seen because of a respiratory influenza-like illness. This figure was down significantly from 9.18% the week before.

In the past week, there have been 11 new viral cultures positive for influenza reported. Four were Influenza A and seven were Influenza B

Nationwide, since October 1, 71% of influenza specimens typed have been A, and 29% have been B. Of those typed as A, 98% were H1N1 and 2% 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. Of the influenza B viruses isolated,52% have been antigenically similar to B Beijing which was included in this year's vaccine. The remaining 48% have been antigenically similar to B Sichuan which has good cross-reactivity with B Beijing. Thus this year's vaccine is providing good coverage against the virus strains known to be circulating in the United States at this time.

Influenza-like activity has continued to decline during the past week.. Reported influenza-like activity has not reached outbreak levels. This activity is similar to what is being reported from the rest of the United States. Although influenza-like activity has decreased in the past week, the influenza season is not over and it is still possible that influenza-like illness may increase again in all parts of New Jersey in the coming weeks.

Northeastern New Jersey


Schools
% Absent
Nursing Homes
% with ILI
Emergency Departments
% visits with ILI
Bergen0.651.374.57
EssexNRNRNR
Hudson5.731.278.15
Middlesex5.394.5911.13
Monmouth5.830.934.79
Passaic14.924.1512.32
Union4.142.228.56
Regional Total5.952.647.94

Northwestern New Jersey


Schools
% Absent
Nursing Homes
% with ILI
Emergency Departments
% visits with ILI
Hunterdon5.914.386.35
MercerNR0.000.93
MorrisNR4.130.79
SomersetNRNRNR
Sussex5.580.998.33
Warren7.45NRNR
Regional Total6.932.922.48

Southern New Jersey


Schools
% Absent
Nursing Homes
% with ILI
Emergency Departments
% visits with ILI
Atlantic 6.382.114.63
Burlington4.960.178.25
Camden5.301.085.69
Cape May6.602.5212.00
Cumberland6.181.025.22
Gloucester6.960.343.23
Ocean8.161.406.41
Salem7.581.83NR
Regional Total6.921.335.90
Statewide Total6.372.017.16

NR = no report