At present, there are a total of 64 survey areas selected for the vector surveillance throughout the territory and the following four different indices will be enumerated:

  1. Area Gravidtrap Index for Aedes albopictus (AGI),
  2. Area Density Index for Aedes albopictus (ADI),
  3. Monthly Gravidtrap Index for Aedes albopictus (MGI), and
  4. Monthly Density Index for Aedes albopictus (MDI).

The AGI and ADI indicate the extensiveness of the distribution and density of Aedine mosquitoes respectively in that particular survey area, while the MGI and MDI are enumerated by pooling together all AGIs and ADIs of the same month reflecting the territory-wide situation of Aedes albopictus.

In addition to the areas in the community, surveys of Aedes albopictus are also carried out to cover all major port areas. The following two different groups of indices will be enumerated:

  1. Port / Monthly Port Gravidtrap Index for Aedes albopictus (PGI/MPGI), and
  2. Port / Monthly Port Density Index for Aedes albopictus (PDI/MPDI).

The Port Gravidtrap Index for Aedes albopictus (PGI) indicates the extensiveness of the distribution of Aedine mosquitoes in a particular group of port areas. The Monthly Port Gravidtrap Index for Aedes albopictus (MPGI) is enumerated by pooling together all PGIs of the same month, which reflects the overall degree of occurrence of Aedes albopictus in port areas. Another index, the Port Density Index for Aedes albopictus (PDI) indicates the density of Aedes albopictus in positive traps in a particular group of port areas. The Monthly Port Density Index for Aedes albopictus (MPDI) is enumerated by pooling together all PDIs of the same month, which denotes the overall density of Aedes albopictus in locales detected with Aedine mosquito activities in port areas.

The Gravidtrap Index for Aedes albopictus is divided into four levels, reflecting the distribution level of the Aedes albopictus. Level 1 (less than 5 per cent) indicates that distribution of Aedes albopictus is not extensive in the area surveyed. Level 2 (5 per cent to less than 20 per cent) indicates that distribution of Aedes albopictus is fairly extensive in the area surveyed. Level 3 (20 per cent to less than 40 per cent) indicates that distribution of Aedes albopictus is extensive in the area surveyed. Level 4 (40 per cent or above) indicates that distribution of Aedes albopictus is very extensive in the area surveyed. Specific preventive and control measures will be initiated accordingly. Management of housing estates, hospitals, schools, construction sites and other venues or properties are also advised to take specific measures to contain mosquito problems in their own properties. The four levels of Gravidtrap Index for Aedes albopictus and actions to be taken by the management are listed in the following table.

Level Gravidtrap Index for Aedes albopictus Actions to be taken
1 G.I. < 5%
(Distribution of Aedes albopictus in the survey area is not extensive)
  • Closely monitor the hygienic condition to prevent breeding of mosquitoes;
  • Conduct weekly inspection to identify breeding / potential breeding places and eliminate such places as far as possible.
  • Public are advised to check and eliminate any possible breeding places within their premises at a frequency not less than once a week (Please go to Advice to the Public for details)
2 5% ≤ G.I. < 20%
(Distribution of Aedes albopictus in the survey area is fairly extensive)
3 20% ≤ G.I. < 40%
(Distribution of Aedes albopictus in the survey area is extensive)
  • To conduct special operations in addition to the regular weekly program to eliminate all breeding / potential breeding places;
  • Private pest control contractor might be employed to control the mosquito problem. Other control measures by using larvicides or adulticides might be feasible.
4 G.I. ≥ 40%
(Distribution of Aedes albopictus in the survey area is very extensive)

With the adoption of Gravidtraps since April 2020, a new index called the Density Index (DI) is also recorded in each survey area.  It is denoted as Area Density Index (ADI) which is enumerated by dividing the number of adult Aedes by the total number of Aedes positive Gravidtraps during the survey period.  The minimum value of the index is one.

The Density Index for Aedes albopictus is divided into three levels, reflecting the abundancy of Aedes albopictus.  Level 1 (1 to 1.5) indicates that mosquito is not abundant in the locations with positive Gravidtraps.  Level 2 (1.6 to 2.4) indicates that mosquito is slightly abundant in the locations with positive Gravidtraps.  Level 3 (2.5 or above) indicates that mosquito is abundant in the locations with positive Gravidtraps.  Specific preventive and control measures will be initiated accordingly.  Management of housing estates, hospitals, schools, construction sites and other venues or properties will also be advised to take specific measures to contain mosquito problems in their own properties.  The three levels of DI and actions to be taken by the management are listed in the following table. 

Level Density Index for Aedes albopictus Actions to be taken
1

1 ≤ D.I. ≤ 1.5
(Mosquito is not abundant in the locations with positive Gravidtraps)

  • Closely monitor the hygienic condition to prevent breeding of mosquitoes;
  • Conduct weekly inspection to identify breeding / potential breeding places and eliminate such places as far as possible.
  • Public are advised to check and eliminate any possible breeding places within their premises at a frequency not less than once a week (Please go to Advice to the Public for details)
2

1.6 ≤ D.I. ≤ 2.4
(Mosquito is slightly abundant in the locations with positive Gravidtraps)

  • Conduct special operations in addition to the regular weekly inspection to eliminate all breeding / potential breeding places at location with high mosquito density
3

D.I. ≥ 2.5
(Mosquito is abundant in the locations with positive Gravidtraps)

  • Private pest control contractor may be employed to control the mosquito problem in target locations. Other control measures by using larvicides or adulticides may also be taken.

Public should refer to the “Action to be taken” for AGI as primary reference.  If both indices are of similar levels, their actions are also similar.  However, if the AGI is low, e.g. Level 1 or Level 2, but level of ADI is high, e.g. Level 3, public should carry out actions for corresponding level of AGIs and supplement with actions for higher level of ADI, e.g. fogging, in locations with high mosquito density.

 Area Gravidtrap Indices and Density Indices for Aedes albopictus for the 64 survey areas in 2022 are provided below:

Hong Kong Island (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Central/Western Central and Admiralty AGI 0.0% 0.0% 0.0% 3.8% 2.9% 15.5% 6.5%
ADI N/A N/A N/A 1.0 2.3 2.0 1.1
Sheung Wan and Sai Ying Pun AGI 0.0% 0.0% 0.0% 0.0% 9.0% 31.3% 22.2%
ADI N/A N/A N/A N/A 1.1 2.3 1.5
Sai Wan AGI 0.0% 0.0% 0.0% 0.9% 23.4% 31.1% 8.9%
ADI N/A N/A N/A 1.0 1.7 1.3 1.6
Eastern Chai Wan West AGI 0.0% 0.0% 0.0% 2.6% 9.6% 15.8% 5.4%
ADI N/A N/A N/A 1.0 1.0 1.0 1.0

Shau Kei Wan and Sai Wan Ho

AGI 1.8% 2.5% 1.7% 5.1% 34.8% 26.3% 11.7%
ADI 1.0 1.0 1.0 1.0 1.7 1.5 1.1
North Point AGI 0.0% 0.0% 0.0% 1.8% 13.6% 16.4% 8.5%
ADI N/A N/A N/A 1.0 1.2 1.4 1.1
Southern Aberdeen and Ap Lei Chau AGI 0.0% 0.0% 0.0% 3.6% 4.6% 19.6% 9.1%
ADI N/A N/A N/A 1.0 1.0 1.4 1.0
Pokfulam AGI 1.7% 0.0% 1.7% 4.4% 12.9% 24.3% 9.6%
ADI 1.0 N/A 1.0 1.0 1.1 1.4 1.0
Deep Water Bay and Repulse Bay AGI 0.0% 0.0% 0.0% 0.0% 3.5% 25.6% 5.9%
ADI N/A N/A N/A N/A 1.3 1.0 1.0
Wanchai Tin Hau AGI 0.9% 0.0% 0.0% 2.7% 6.3% 17.4% 16.2%
ADI 1.0 N/A N/A 1.0 1.3 1.8 1.5
Wan Chai North AGI 0.9% 0.0% 0.9% 0.0% 8.0% 3.6% 2.7%
ADI 1.0 N/A 1.0 N/A 1.1 1.0 1.0
Happy Valley AGI 0.0% 0.0% 0.0% 1.8% 2.7% 19.6% 9.1%
ADI N/A N/A N/A 1.0 1.0 1.5 1.0
Islands (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Islands Cheung Chau South
(Formerly: Cheung Chau)
AGI 0.0% 0.0% 0.0% 0.0% 9.7% 22.7% 4.3%
ADI N/A N/A N/A N/A 1.5 1.7 1.3
Cheung Chau North AGI 0.0% 0.0% 0.0% 5.7% 12.3% 20.9% 4.6%
ADI N/A N/A N/A 1.0 1.5 1.4 1.0
Tung Chung AGI 0.0% 0.0% 0.0% 4.0% 1.0% 6.0% 9.1%
ADI N/A N/A N/A 1.8 1.0 1.3 1.1
Kowloon (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Yau Tsim Tsim Sha Tsui AGI 0.0% 0.0% 0.0% 0.0% 6.3% 7.1% 0.8%
ADI N/A N/A N/A N/A 1.0 1.2 1.0
Tsim Sha Tsui East AGI 0.0% 0.0% 0.0% 1.0% 8.4% 24.3% 13.0%
ADI N/A N/A N/A 1.0 1.0 1.4 1.2
Mong Kok Mong Kok AGI 0.0% 0.0% 0.0% 0.8% 0.8% 6.8% 8.5%
ADI N/A N/A N/A 1.0 1.0 1.0 1.4
Sham Shui Po Cheung Sha Wan AGI 0.0% 0.9% 0.0% 5.3% 8.9% 24.3% 13.5%
ADI N/A 1.0 N/A 1.0 1.2 1.8 2.3
Lai Chi Kok AGI 0.0% 0.0% 0.0% 0.9% 6.1% 12.3% 6.3%
ADI N/A N/A N/A 1.0 1.7 1.6 1.0
Sham Shui Po East AGI 0.0% 0.0% 0.0% 2.8% 10.0% 19.8% 7.8%
ADI N/A N/A N/A 1.3 1.0 1.1 1.3
Kowloon City Ho Man Tin AGI 0.0% 0.0% 0.0% 0.9% 8.2% 17.4% 9.3%
ADI N/A N/A N/A 1.0 1.0 1.3 1.1
Kowloon City North AGI 0.0% 0.0% 0.0% 0.0% 9.3% 10.9% 1.8%
ADI N/A N/A N/A N/A 1.0 1.0 1.0
Hung Hom AGI 0.0% 0.0% 0.0% 3.6% 15.5% 42.5% 25.0%
ADI N/A N/A N/A 1.0 1.4 1.4 1.3
Lok Fu West AGI 0.0% 0.0% 2.5% 3.4% 13.4% 25.0% 7.4%
ADI N/A N/A 1.0 1.3 1.3 1.3 1.0
Kai Tak North AGI 1.2% 0.0% 0.0% 3.8% 18.3% 38.0% 23.8%
ADI 1.0 N/A N/A 1.0 1.3 1.7 1.5
Wong Tai Sin Wong Tai Sin Central AGI 0.0% 0.0% 0.0% 0.9% 2.7% 14.5% 10.7%
ADI N/A N/A N/A 1.0 1.0 1.3 1.3
Wong Tai Sin West AGI 0.0% 0.0% 0.0% 0.0% 6.6% 18.7% 4.7%
ADI N/A N/A N/A N/A 1.0 1.3 1.0
Diamond Hill AGI 0.0% 0.0% 0.0% 0.0% 3.5% 12.9% 6.0%
ADI N/A N/A N/A N/A 1.0 1.1 1.0
Ngau Chi Wan AGI 0.9% 0.0% 0.0% 2.9% 6.5% 17.9% 7.5%
ADI 1.0 N/A N/A 1.3 1.1 1.1 1.1
Kwun Tong Kwun Tong Central AGI 0.0% 0.0% 1.6% 4.0% 17.2% 38.3% 7.5%
ADI N/A N/A 1.0 1.2 1.3 2.0 1.2
Lam Tin AGI 0.0% 0.0% 1.7% 1.7% 7.6% 11.1% 12.9%
ADI N/A N/A 2.0 1.0 1.2 1.5 1.0
Yau Tong AGI 0.0% 0.0% 0.0% 0.0% 5.3% 8.1% 11.1%
ADI N/A N/A N/A N/A 1.3 1.5 1.0
Kowloon Bay AGI 0.0% 0.0% 0.0% 3.3% 16.9% 15.8% 7.6%
ADI N/A N/A N/A 1.0 1.1 1.0 1.0
New Territories (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sai Kung Tseung Kwan O West
(Formerly: Tseung Kwan O South)
AGI 0.0% 0.0% 0.9% 3.7% 9.1% 23.1% 5.9%
ADI N/A N/A 1.0 1.0 1.6 1.0 1.0
Tseung Kwan O East AGI 0.0% 0.0% 0.0% 1.9% 6.7% 19.4% 8.3%
ADI N/A N/A N/A 1.0 1.1 1.9 1.0
Tseung Kwan O North AGI 0.0% 0.0% 1.1% 4.5% 4.6% 23.0% 8.1%
ADI N/A N/A 1.0 1.0 1.0 2.1 1.0
Sai Kung Town AGI 1.0% 0.0% 1.0% 1.0% 28.3% 42.9% 9.5%
ADI 1.0 N/A 1.0 1.0 1.8 1.7 1.2
Ngau Liu and Muk Min Shan AGI 0.0% 0.0% 0.0% 10.0% 36.0% 32.0% 20.0%
ADI N/A N/A N/A 1.2 1.6 1.6 1.4
Sha Tin Tai Wai AGI 0.0% 0.0% 0.0% 5.6% 5.6% 11.2% 8.1%
ADI N/A N/A N/A 1.7 1.3 1.5 1.2
Sha Tin East AGI 0.0% 0.0% 0.0% 0.8% 5.7% 9.1% 9.0%
ADI N/A N/A N/A 1.0 1.0 1.0 1.2
Ma On Shan AGI 0.8% 0.0% 0.8% 2.4% 42.5% 37.5% 28.4%
ADI 1.0 N/A 1.0 1.0 1.6 1.8 1.5
Sha Tin Town Centre and Fo Tan AGI 1.9% 0.0% 0.0% 1.9% 5.7% 27.4% 10.5%
ADI 1.0 N/A N/A 2.0 1.0 1.3 1.4
Tai Po Tai Po West AGI 0.0% 0.0% 0.0% 0.9% 7.8% 17.0% 6.2%
ADI N/A N/A N/A 1.0 1.0 1.0 1.0
Tai Po East AGI 0.0% 0.0% 0.0% 1.9% 15.7% 21.4% 9.0%
ADI N/A N/A N/A 1.0 1.4 1.7 1.1
North Fanling AGI 0.0% 0.0% 0.9% 4.4% 7.9% 21.9% 16.5%
ADI N/A N/A 1.0 1.0 1.1 1.6 1.4
Sheung Shui AGI 0.0% 0.0% 0.0% 4.4% 17.2% 55.3% 31.8%
ADI N/A N/A N/A 1.0 1.2 2.8 1.3%
Yuen Long Tin Shui Wai AGI 0.0% 0.0% 0.0% 0.0% 6.3% 15.9% 6.3%
ADI N/A N/A N/A N/A 1.0 1.2 1.0
Yuen Kong AGI 0.0% 0.0% 0.0% 0.0% 10.0% 10.0% 2.0%
ADI N/A N/A N/A N/A 1.0 1.2 1.0
Yuen Long Town AGI 0.0% 0.0%

0.0%

0.9% 5.5% 34.9% 7.3%
ADI N/A N/A N/A 1.0 1.2 1.5 1.3
Ki Lun Shan AGI 0.0% 0.0% 0.0% 2.0% 8.0% 12.0% 4.1%
ADI N/A N/A N/A 1.0 1.0 1.0 1.0
Sung Shan AGI 0.0% 0.0% 0.0% 2.1% 8.3% 12.8% 2.1%
ADI N/A N/A N/A 1.0 1.0 1.7 1.0
Tuen Mun Tuen Mun North AGI 0.0% 0.0%

0.0%

0.8% 6.9% 20.9% 3.8%
ADI N/A N/A N/A 1.0 1.1 2.4 1.2
Tuen Mun South AGI 0.0% 0.0% 0.0% 0.0% 7.5% 23.3% 13.1%
ADI N/A N/A N/A N/A 1.5 2.1 1.2
Tuen Mun West AGI 1.0% 0.0% 1.1% 1.0% 9.7% 14.6% 14.9%
ADI 1.0 N/A 2.0 1.0 1.1 1.2 1.1
So Kwun Wat AGI 0.0% 0.0% 0.0% 0.9% 8.7% 41.8% 12.1%
ADI N/A N/A N/A 1.0 1.2 1.7 1.4
Tsuen Wan Tsuen Wan Town AGI 0.0% 0.0% 0.8% 2.5% 8.6% 9.2% 7.8%
ADI N/A N/A 1.0 1.0 1.4 1.5 1.2
Tseun Wan West AGI 0.0% 0.0% 0.0% 1.0% 8.7% 23.1% 5.6%
ADI N/A N/A N/A 1.0 1.9 1.8 1.0
Ma Wan AGI 2.0% 2.0% 2.2% 4.2% 14.6% 16.3% 10.4%
ADI 1.0 1.0 1.0 1.0 1.3 1.3 1.2
Sheung Kwai Chung AGI 0.0% 0.0% 0.9% 3.7% 8.3% 22.7% 6.7%
ADI N/A N/A 1.0 1.0 1.2 1.1 1.0
Kwai Tsing Kwai Chung AGI 0.0% 0.0% 0.0% 3.4% 7.0% 10.5% 3.5%
ADI N/A N/A N/A 1.0 1.0 1.0 1.3
Lai King AGI 0.0% 0.0% 0.0% 3.8% 26.7% 25.0% 7.8%
ADI N/A N/A N/A 1.0 1.6 1.5 1.3
Tsing Yi South AGI 0.0% 0.0% 0.0% 0.9% 9.5% 27.6% 9.6%
ADI N/A N/A N/A 1.0 1.1 2.1 1.1
Tsing Yi North AGI 0.0% 0.0% 0.0% 4.6% 8.3% 18.3% 12.8%
ADI N/A N/A N/A 1.4 1.0 1.7 1.4

Remarks:
Gravidtrap Index figures in green:                Level I : Gravidtrap Index <5.0% (indicates that the distribution of Aedes albopictus in the survey area is not extensive)
Gravidtrap Index figures in yellow:               Level II : 5.0% ≤ Gravidtrap Index <20.0% (indicates that the distribution of Aedes albopictus in the survey area is fairly extensive)
Gravidtrap Index figures in red:                      Level III : 20.0%≤  Gravidtap Index <40.0% ( indicates that the distribution of Aedes albopictus in the survey area is extensive)
Gravidtrap Index figures in purple:                Level IV : Gravidtrap Index ≥40.0% (indicates that the distribution of Aedes albopictus is very extensive)

Density Index figures in green:                      Level I : 1.0 ≤ Density Index ≤ 1.5 (Aedes albopictus is not abundant in the locations with positive Gravidtraps)
Density Index figures in yellow:                     Level II : 1.6 ≤ Density Index ≤ 2.4 (Aedes albopictus is slightly abundant in the locations with positive Gravidtraps)
Density Index figures in red:                          Level III : Density Index ≥ 2.5 (Aedes albopictus is abundant in the locations with positive Gravidtraps)

Number of areas in respective levels of Survey Area Gravidtrap Indices in 2022 are provided below:

Number of survey areas Total number of survey areas Top 5 survey areas at level 3 Top 5 survey areas at level 4
Level 1 Level 2 Level 3 Level 4
0%-<5% 5%-<20% 20%-<40% ≥40%
Jan 64 0 0 0 64 Nil Nil
Feb 64 0 0 0 64 Nil Nil
Mar 64 0 0 0 64 Nil Nil
Apr 59 5 0 0 64 Nil Nil
May 9 49 5 1 64 1. Ngau Liu and Muk Min Shan (36.0%)
2. Shau Kei Wan & Sai Wan Ho (34.8%)
3. Sai Kung Town (28.3%)
4. Lai King (26.7%)
5. Sai Wan (23.4%)
1. Ma On Shan (42.5%)
Jun 1 33 26 4 64 1. Kwun Tong Central (38.3%, 2.0)
2. Kai Tak North (38.0%, 1.7)
3. Ma On Shan (37.5%, 1.8)
4. Yuen Long Town (34.9%, 1.5)
5. Ngau Liu and Muk Min Shan (32.0%, 1.6)
1. Sheung Shui (55.3%, 2.8)
2. Sai Kung Town (42.9%, 1.7)
3. Hung Hom (42.5%, 1.4)
4. So Kwun Wat (41.8%, 1.7)
Jul 11 47 6 0 64 1. Sheung Shui (31.8%, 1.3)
2. Ma On Shan (28.4%, 1.5)
3. Hung Hom (25.0%, 1.3)
4. Kai Tak North (23.8%, 1.5)
5. Sheung Wan and Sai Ying Pun (22.2%, 1.5)
Nil

Port Gravidtrap Indices and Port Density Indices for Aedes albopictus in 2022 are provided below:

Port areas (Map)
Port Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hong Kong International Airport PGI 0.0% 0.0% 0.0% 0.0% 0.7% 1.3%
PDI N/A N/A N/A N/A 1.0 1.2
Cross Boundary Check Points on Land PGI 0.0% 0.1% 0.2% 1.4% 6.3% 10.2%
PDI N/A 1.0 1.0 1.1 1.4 1.5
Private Cargo Working Areas PGI 0.0% 0.0% 0.3% 0.6% 6.8% 14.3%
PDI N/A N/A 1.0 1.0 1.2 1.5
Cross Boundary Ferry Terminals PGI 0.0% 0.0% 0.0% 0.0% 0.5% 2.2%
PDI N/A N/A N/A N/A 1.0 1.0
Container Terminals PGI 0.0% 0.0% 0.0% 0.1% 1.2% 1.2%
PDI N/A N/A N/A 1.0 1.0 1.0
Public Cargo Working Areas PGI

0.3%

0.0% 0.0% 1.1% 6.2% 12.2%
PDI 1.0 N/A N/A 1.0 1.5 1.2

Remarks:
Gravidtrap Index figures in green:                 Level I : Gravidtrap Index <5.0% (indicates that the distribution of Aedes albopictus in the survey area is not extensive)
Gravidtrap Index figures in yellow:               Level II : 5.0% ≤ Gravidtrap Index <20.0% (indicates that the distribution of Aedes albopictus in the survey area is fairly extensive)
Gravidtrap Index figures in red:                      Level III : 20.0%≤  Gravidtap Index <40.0% ( indicates that the distribution of Aedes albopictus in the survey area is extensive)
Gravidtrap Index figures in purple:                Level IV : Gravidtrap Index ≥40.0% (indicates that the distribution of Aedes albopictus is very extensive)

Density Index figures in green:                      Level I : 1.0 ≤ Density Index ≤ 1.5 (Aedes albopictus is not abundant in the locations with positive Gravidtraps)
Density Index figures in yellow:                     Level II : 1.6 ≤ Density Index ≤ 2.4 (Aedes albopictus is slightly abundant in the locations with positive Gravidtraps)
Density Index figures in red:                          Level III : Density Index ≥ 2.5 (Aedes albopictus is abundant in the locations with positive Gravidtraps)

The comparison of Monthly Gravidtrap Index and Monthly Density Index for Aedes albopictus between 2021 and 2022 are shown below.

The comparison of Monthly Gravidtrap Index and Monthly Density Index for <em>Aedes albopictus</em> between 2020 and 2021

The comparison of Monthly Gravidtrap Index and Monthly Density Index for <em>Aedes albopictus</em> between 2020 and 2021

The Monthly Gravidtrap Index for Aedes albopictus for June 2022 is 21.1%.

The Monthly Density Index for Aedes albopictus for June 2022 is 1.6.

The Port Monthly Gravidtrap Index for Aedes albopictus for June 2022 is 4.8%.

The Port Monthly Density Index for Aedes albopictus for June 2022 is 1.4.

For historical information in respect of the previous ovitrap indices, please refer to the followings: 

Please click here for the Monthly Ovitrap Index, Gravidtrap Index and Density Index for Aedes albopictus from 2010 to 2021.

Please click here for a graph of the Monthly Ovitrap Index for Aedes albopictus from 2010 to March 2020.

Please click here for a graph of the Monthly Gravidtrap Index for Aedes albopictus from April 2020 to 2021.

Please click here for a graph of the Monthly Density Index for Aedes albopictus from April 2020 to 2021.

Please click here for the Port Monthly Ovitrap Index, Gravidtrap Index and Density Index for Aedes albopictus from 2010 to 2021.