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Florida Mosquito Control Association |
Arbovirus Surveillance Reports - 2001 Annual Arbovirus Surveillance Summary Report: 2001 January 2001. With our continuing cold weather and drought, the numbers of sera submitted and counties participating in surveillance activities during January were less than that for December. There were no seroconversions to Eastern Equine Encephalitis virus (EEE) or to St Louis Encephalitis virus (SLE)during January. This is similar to the median historical levels for January. I had the privilege of attending the 2nd National West Nile Planning Conference that was held in Charlotte, NC, from January 31 through February 4, 2001. Reports from a number of states, where the virus has already been detected,about their activities related to it and to other arboviruses, were among those presented. Committees met each evening to revise the national guidelines for surveillance, prevention and control of WNV. Many states were totally unprepared for dealing with this type of vector-borne disease. However, Florida should be proud of its Arbovirus Surveillance System. Not only do we have laboratory expertise, we also have developed over the years an effective network of cooperation and communication among a diverse array of state and local agencies, governmental and private, that provides expertise in epidemiology, case investigation, mosquito control, animal health, prevention and risk communication and more. Kudos to you all. Historical HAI results. February 2001. With our continuing cold weather and drought, the numbers of sera submitted and counties participating in surveillance activities during February were similar to the level of activity for January. There were no seroconversions to Eastern Equine Encephalitis virus (EEE). There was one, as yet unconfirmed seroconversion to St Louis Encephalitis virus (SLE)during January. This is similar to the median historical levels for February. Historical HAI results. March 2001 With our continuing cool weather and drought, the numbers of sera submitted and counties participating in surveillance activities during March were similar to the level of activity for February. There were no seroconversions to Eastern Equine Encephalitis virus (EEE) or to St Louis Encephalitis virus (SLE)during March. The late February seroconversion to SLE in Lee County was confirmed in March. Monthly activity is similar to the median historical levels for March. Historical HAI results. April 2001 ***The Tampa Branch Laboratory is moving. As of May 29, 2001 our address will be:3602 Spectrum Boulevard, Tampa, FL 33612. Our new telephone number will be 813/974-8000 (sc:574-8000). Additional details as they relate to the Arbovirus Surveillance Program will be coming to you soon.*** The numbers of sera submitted and counties participating in surveillance activities during April were increased from the level of activity for March. There was one seroconversion to Eastern Equine Encephalitis virus (EEE) and no seroconversions to St Louis Encephalitis virus (SLE)during April. Monthly activity is similar to the median historical levels for April. Historical HAI results. No May 2001 Report June 2001 The Tampa Branch Laboratory has moved and we getting used to our new surroundings. As of May 29, 2001 our address is: 3602 Spectrum Boulevard, Tampa, FL 33612. Our new telephone number is 813/974-8000 (sc:574-8000). Dr. Kazanis is at extension 8072 and Dr. Stark is at extension 5990. The numbers of sera submitted and counties participating in surveillance activities during June were increased from the level of activity for May. There were 10 seroconversions to Eastern Equine Encephalitis virus (EEE) and 2 seroconversions (not yet confirmed) to St Louis Encephalitis virus (SLE) during June. Monthly activity is similar to the median historical levels for June. West Nile Virus has been detected for the first time in Florida, in a dead bird, Corvus ossifragus, found in Jefferson County, on June 18, 2001. Historical HAI results: July 2001. Since our report on West Nile Virus detection in tissues from a dead bird Florida in early July, the numbers of samples for HAI serology and also for virus isolation have increased dramatically. All chicken sera that react with SLE antigen in the HAI assay are then tested for both SLE and WN antibody using the IgM Elisa. We are in the process of developing an effective report format for those results, and will include it with the next monthly report, in addition to routine weekly reporting. There were 9 seroconversions to Eastern Equine Encephalitis virus (EEE) and 2 seroconversions to a Flavivirus (St Louis Encephalitis virus (SLE) antigen) during July. Monthly activity is similar to the median historical levels for July. Historical HAI results: August 2001 The numbers of sera submitted and counties participating in surveillance activities during August were increased from the level of activity for July. There were 15 seroconversions to Eastern Equine Encephalitis virus (EEE) and 11 seroconversions to a Flavivirus (St Louis Encephalitis virus (SLE) antigen) during August; 9 of these were confirmed as due to West Nile (WNV) virus. EEE monthly activity is slightly above the median historical levels for August. SLE activity is below the median, but well within the normal range. There is no historical data available for WN. Since our report on West Nile Virus detection in tissues from a dead bird Florida in early July, the numbers of samples for HAI serology and for virus isolation have increased dramatically. During August, tissues from 2110 birds and 16 mammals were received for virus detection/isolation. Since July EEE has been detected tissues from 3 mammals and 7 birds and WNV has been detected in 1 mammal and 91 birds. Historical HAI results September 2001 The numbers of sera submitted and counties participating in surveillance activities during September were similar to the level of activity for August. There were 4 seroconversions to Eastern Equine Encephalitis virus (EEE) and 74 seroconversions to a Flavivirus (St Louis Encephalitis virus (SLE) antigen in the HAI assay) during September; 72 of these were confirmed as due to West Nile (WNV) virus, 2 (Sarasota and Palm Beach) were due to SLE. EEE monthly activity is similar to the median historical levels for September. SLE activity is below the median. There is no historical data available for WN. Since our report on West Nile Virus detection in tissues from a dead bird Florida in early July, the numbers of samples for HAI serology and for virus isolation have increased dramatically. During September, tissues from 1641 birds and 12 mammals were received for virus detection/isolation: EEE was detected tissues from 2 mammals and 0 birds, WNV was detected in 1 mammal and 192 birds. 129 mosquito pools were assayed: 1 WN+ pool of Oc. Atlanticus and 1 unidentified virus were detected. Historical HAI results October 2001 The numbers of sera submitted and counties participating in surveillance activities during October were similar to the level of activity for September. There were 7 seroconversions to Eastern Equine Encephalitis virus (EEE) and 76 seroconversions to a Flavivirus (St Louis Encephalitis virus (SLE) antigen used in the HAI assay) during October. All Flavivirus antibody positive sentinels were confirmed as due to West Nile (WNV) virus. No SLE activity was detected in the state this past month; this is significantly below median and mean levels for SLE during October. EEE monthly activity is similar to the median historical levels for October. There is no historical data available for WN. Since our report on West Nile Virus detection in tissues from a dead bird Florida in early July, the numbers of samples submitted for HAI serology and for virus isolation have been high. During October, tissues from 2324 birds and 11 mammals were received for virus detection/isolation: EEE was detected tissues from 0 mammals and 3 birds, WNV was detected in 3 mammals and 212 birds. 304 mosquito pools were assayed: West Nile Virus was detected in 2 pools of Oc. taeniorhyncus, one from Bay County and one from Monroe County. Historical HAI results November 2001 The numbers of sera submitted and counties participating in surveillance activities during November were reduced from the level of activity for October. There were 9 seroconversions to Eastern Equine Encephalitis virus (EEE) and 23 seroconversions to a Flavivirus (St Louis Encephalitis virus (SLE) antigen used in the HAI assay) during November. All Flavivirus antibody positive sentinels were confirmed as due to West Nile (WNV) virus. No SLE activity was detected in the state this past month; this is significantly below median and mean levels for SLE during October. EEE monthly activity is similar to the median historical levels for November. There is no historical data available for WN. Since our report on West Nile Virus detection in tissues from a dead bird Florida in early July, the numbers of samples submitted for HAI serology and for virus isolation have been high. During November, tissues from 564 birds and 4 mammals were received for virus detection/isolation: WNV was detected in 2 mammals and 266 birds. 265 mosquito pools were received: West Nile Virus was detected in 2 pools, one from Monroe County (An. atropos) and one from Pinellas County (Cs. Melanura). Historical HAI results December 2001 . The numbers of sera submitted and counties participating in surveillance activities during December were slightly reduced from the level of activity for November. There were 7 seroconversions to Eastern Equine Encephalitis virus (EEE) and 12 seroconversions to a Flavivirus (St Louis Encephalitis virus (SLE) antigen used in the HAI assay) during December. All Flavivirus antibody positive sentinels were confirmed as due to West Nile (WNV) virus. No SLE activity was detected in the state this past month; this is significantly below median and mean levels for SLE during November. EEE monthly activity is similar to the median historical levels for December. There is no historical data available for WN. Since our report on West Nile Virus detection in tissues from a dead bird Florida in early July, the numbers of samples submitted for HAI serology and for virus isolation have been high. During December, tissues from 315 birds and 2 mammals were received for virus detection/isolation: WNV was detected in 1 mammal and 258 birds. 288 mosquito pools were received: West Nile Virus was detected in 2 pools, both from Monroe County (Oc. taeniorhynchus, D. cancer). We are preparing the annual summary data at this time and a report will be forwarded when it is ready. Historical HAI results  back
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