According to WHO, in last 5 decades dengue infections has shot up 30 fold, because of its complex patho-physiological, ecological as well as economical problems⁸. In current study majority of patients were males (380 males out of 640 patients)than females, this may due to males are more exposed to mosquitoes in outdoor activity similar findings were reported in Gupta et al. and Dar es Salaam 2014 outbreak^9,10.

In the current study large number i.e. 81.69% of dengue cases are from age group between 31 to 40 years which is similar to the study MM Kauser et al.¹¹. Kaushik M. et al.⁴Dhruba et al.¹ , Ghouth et al.¹² and PadhiS et al.¹³ reported that most common affected age group was 11-20 years, the difference may be the study population and sample size. In the present study positive rate was high in urban population compared to the rural population. Urbanization tends to increase the number of habitats suitable for Aedesaegypti. The Aedesaegypti mosquito population was highest in slum houses, shop houses and multistoreyed flats.

In the current study highest number of dengue cases were reported in the post-monsoon period similar results were found in study done by Lata R. patel et al.¹⁴ During monsoon period heavy rains leads to stagnation of large amount of water. These are the favourite breeding places for vector mosquito. This may be the cause for more number of cases in post-monsoon season.

Single stranded RNA virus belonging to genus flavivirus, is responsible for acute illness in dengue. 4 to 10 days was the incubation period for dengue fever. Febrile phase, critical phase and recovery phase are these conditions seen in dengue infection^{9 &10}. Overall sero-positivity rate was 62.2% (398/640). In the current study over all NS1 detection was 220 (49.7%) patients were positive, Results were correlating with other study by Anitha Chakravarti 35(39.7%). In dengue infection the role of NS1 Ag for early detection is currently being assess by many investigators, without the requirement of paired sera (Two serum samples taken from a patient usually at 1 week apart)and it circulates uniformly in all serotypes of dengue and there is no cross reaction of dengue NS1 antigen with other flaviviruses ^13-15. The NS1 is produced in high concentration in the serum during acute phase (0-6 days) of infection. The sensitivity varies between 85.5 and 95.9% and specificity between 95.0 and 100% using the viral isolation as a reference test^16,17.

Dengue IgM can be detected within 3-5 days in 50% people after onset of symptoms, and 80% after day 5 and to 99% on day 10they and not detected after 2–3 months. IgM is not specific, they can cross-reaction with other flaviviruses and also with rheumatoid factor¹⁷. So if the patient sample is reactive for NS1 Ag and IgM antibodies instead of IgM only, that is more specific. At end of the first week of onset symptoms, IgG antibodies will detect and remain life-long in some patients. Detection of NS1 and IgG, IgM and IgG detection indicates the seroconverstion stage of infection. If only IgG Abs detection in serum, it indicates past infection, secondary infection or cross-reaction with other flaviviruses antigen¹⁷. In the current study fever was present in all the patients (100%), followed by headache and body pains which is similar to the other studies^18-20. Only 16.32% were stayed in the hospital more than 5 days which is similar to the other study carried out by Solanke SN et al. at Jalna²⁰. In the current study no mortality was found.