Dear patient Salmonella typhi leads to enteric fever aka typhoid fever which affects small intestine. It has different strains s.typhi o , s.typhi h , s.typhi A and B. So when a person is affected by this bacteria human body forms antibodies affected gains bacteria which are detected in blood when tested and their level is tested.since in your blood s.typhi o and h titre is increased it suggests possibility of having enteric fever. But the titre level of positivity varies in different regions. So you need to consult physician and start medication asap. After dengue fever body immune response is slow and hence increased susceptibility to bacterial infection is there.