Swine flu cases are increasing nowadays. The reasons ma be:
1. Unhygienic conditions prevailing in the surroundings. Various types of insects and bacteria will grow if the surroundings are not maintained tidy.
2. This is rainy season. The moisture percentage in atmosphere will be hig. At the same time outside temperatures are high. High humidity with a little high temperature may be a good condition for this virus to grow.
3.Sudden changes in the atmosphere, high heat for some time, rain for some time, again high temperature may also be a cause for this.