Dengue Formula of 20 - Remember the Formula of 20 to identify high risk patients: o Rise in pulse by 20 o Fall in upper blood pressure by more than 20 o Rise in hematocrit by more than 20 percent o Rapid fall in platelets to less than 20,000 o More than 20 hemorrhagic spots on the arm in one inch after tourniquet test o Difference between upper and lower blood pressure is less than 20 Start fluid replacement at 20 ml/kg/hour immediately in such patients, and shift to nearest medical center for observation. • The best way to reduce chances of getting the infection is to eliminate the places where the mosquito breeds. Plastic containers, buckets, drums etc. that hold water in and around the home should be kept covered or discarded properly. Outdoors, water containers like pet and animal water containers, flower planter dishes should be emptied and scrub cleaned at least once a week.