Cases of vector-borne diseases are usually reported between mid-July and November-end, but this period may stretch up to mid-December.
"Three cases of dengue have been reported till January 20. However, no cases of malaria or chikungunya have been reported," according to a municipal report released today.
There was no case of any vector-borne disease till January 13.
At least 10 people died in Delhi due to dengue last year, according to the South Delhi Municipal Corporation (SDMC), which tabulates the data for the entire city.
The vector-borne disease had affected 9,271 people in the national capital in 2017.
Five of the 10 victims were not Delhi residents, but had died in the national capital.
The official toll maintained by the Delhi municipal authorities till December 26 stood at four, even though some hospitals had reported a few more deaths due to dengue.
Three more deaths were reported in October by the SDMC.
The numbers of malaria and chikungunya cases recorded in 2017 stood at 1,142 and 940 respectively.
Of the 9,271 dengue cases, 4,726 patients were from Delhi, while 4,545 had come to the city from other states for treatment, according to the SDMC's last report.
In 2016, at least 21 dengue deaths were reported from various city hospitals, including nine at AIIMS, though the official figure of the civic bodies was 10.
Seventeen deaths, suspected to be due to malaria, were also reported by the civic bodies in 2016. At least 15 fatalities were also reported from various city hospitals due to complications triggered by chikungunya, though the civic authorities had kept the death tally, due to it, at zero.