REPORT OF THE MANAGER

OCTOBER 2017

 

 

I.                   Water and Weather

 

The National Weather Service, Hanford reported temperatures in October had an average high of 80°F and an average low of 48°F. Both the average high and low were 10˚F lower than last month.  The thirty-year average for October is 79°F and 50°F respectively.

 

Water storage levels at Pine Flat Reservoir were recorded at 469,524 acre-feet at the end of the month, approximately 140,000 acre-feet less that the month of September.  Inflow was 730 cubic feet per second (CFS) and release was 2,209 CFS.  Lake Kaweah Reservoir water storage was recorded at 17,791 acre-feet at the end of the month, which is roughly equal to recorded storage values in September.  The inflow and outflow were 68 CFS and 45.9 CFS respectively.

 

II.                Narrative

 

The Delta Vector Control District laboratory staff wrapped up its WNV surveillance program after no positive mosquito pools were detected in the first week of October. Mosquito abundance in suburban areas decreased dramatically as the nightly temperatures dropped to 50˚F, with an average of 3 mosquitoes recorded per trap-night during the month. As of October 10th, 575 mosquito collections had tested positive for WNV out of 2,844 pools tested.

 

Surveillance of invasive Aedes aegypti mosquitoes continued throughout the month of October. Properties in the Beverly Glenn neighborhood that were found to have breeding upon previous inspections were re-inspected to ensure sanitation and home owner education prevented further breeding. Yard inspections also took place in several additional neighborhoods that were discovered to have Aedes aegypti based on surveillance trapping and service requests. Minimal breeding was found in these neighborhoods as compared to Beverly Glenn with only 1/10 homes breeding mosquitoes, usually localized to one breeding site.    

 

Zone Technicians completed catch basin treatments, dairy drain treatments, and fall crop mapping through the month of October. There were no weed treatments made during the month. All remaining seasonal employees were released from service on October 20th. Lab personnel were teamed with full time technicians to perform Aedes aegypti inspections in the Beverly Glenn area following the release of seasonals.

 

 

    

 

There were sixteen service requests during the month categorized as follows:

 

2017 Service Request Summary

                                                                                                                                   

 

Fish

Inspection

Mosquito

Source

Other

Total

January

0

0

0

0

0

  0

February

1

4

0

0

2

7

March

8

11

1

18

8

46

April

7

13

6

17

4

47

May

6

20

0

18

1

45

June

3

20

4

4

1

32

July

0

4

2

3

0

9

August

0

13

12

13

1

39

September

4

18

22

3

1

48

October

0

6

7

3

0

16

Total

29

109

54

79

18

289

           

·         Three of the six mosquito service requests were related to invasive Aedes aegypti mosquitoes

 

 

III.             Vector and Disease Surveillance

 

Delta VCD Summaries

           

Humans: No new cases of human West Nile Virus have been reported to the district. This leaves the total at 2 confirmed cases of WNV this season. 

 

No additional Aedes-borne disease cases (Zika, Dengue, Yellow Fever, Chikungunya) were reported to the District.

 

Birds: Two dead birds were reported within Tulare County. The birds did not meet the requirements for testing.

 

Mosquito: A total of 364 traps were set among all trap types. A total of 12 mosquito pools were tested with 0 pools testing positive for WNV and 2 testing positive for SLEV. The graphs below compare 2017 and 2016 gravid trap counts to date, as well as the WNV infection rate in mosquitoes, reported as percent positive.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The invasive Aedes surveillance program set a total of 138 Aedes specific traps in the month of October, making up a total of 30% of all mosquito traps set.  BG trap counts from the Visalia neighborhood with active Aedes aegypti infestation did show a slight decrease when comparing September and October values. The average BG trap collected 1 Aedes aegypti mosquito and trap counts ranged from 1-2 mosquitoes. Considering climatic conditions in October were less optimal for Aedes aegypti reproduction, a decrease in average trap count was expected. 

 

Three locations within the district (Farmersville, South Visalia, and East Visalia) were inspected for Aedes aegypti presence after multiple surveillance trapping efforts resulted in positive A. aegypti detections. In each of the follow up inspection campaigns 10-12 homes were inspected for larval habitats. One house per inspection campaign was found to have larval stages of Aedes aegypti providing evidence that Aedes aegypti are in fact widespread, and persisting at relatively low population levels throughout the District. Delta VCD laboratory staff are actively preparing for a substantial population expansion of Aedes aegypti in the 2018 season.    

 

          State Surveillance:

Humans: As of November 3rd 2017, 24 new human cases of WNV were reported by the California Department of Public Health (CDPH) from numerous counties throughout CA. To date this year 427 human cases of WNV have been reported, 75% of the cases presented with neuroinvasive disease. At this time in 2016, 380 human cases had been reported. Los Angeles County contains the majority of WNV cases at 231 human cases. 

Birds:  As of November 3rd 2017, 484 birds have been reported positive for WNV to CDPH. In comparison at the end of October 2016, 1,340 birds had been reported positive. 

Mosquitoes: As of November 3rd 2017, 3,350 mosquito pools have been reported positive for WNV by CDPH from 26 counties. In comparison, at this time last year, 3,491 mosquito pools had tested positive from 31 counties. In addition, 179 mosquito pools have tested positive for SLEV to date, from 14 counties. While in 2016 SLEV was present only in Southern California counties, SLEV has now been detected in mosquitoes as far north as Placer and Butte counties.

 

IV.             Expenditures & Revenues – 2017/18

 

            TOTAL BUDGET                                          $4,205,079.78

 

EXPENDITURES – July 1 – October 31, 2017

Salaries

$937,733.71

Services & Supplies

$279,241.88

Tax Admin Fee

 

Capital

$1,513.44

Long-Term Debt

 

TOTAL EXPENDITURES

$1,218,489.03

             

 

REVENUE RECEIVED – July 1 – October 31, 2017

July

$533.21

August

$158.70

September

$12,310.49

October

$205.60

TOTAL REVENUE TO DATE

$13,208.00

                       

V.                Time Sheet Summary                

       

Month

Available Work Hrs

Sick Hrs Used

Total Hrs Available for Work

Pct. Of Hrs Avail for Work

July

4320

66.50

4253.50

98.46

August

4600

30.75

4569.25

99.34

September

4000

207.25

3792.75

94.82

October

2824

137.15

2686.85

95.15

 

The District has a vacation policy that requires 24 hour notice in order to ensure the operational integrity of the workforce.  Sick leave for doctor, dentist and/ or family medical necessity also requires advance notice- in so much as it is possible.  Illness is unplanned and therefore unscheduled.  Attendance records for the current year are shown in the table.