In chronological order these included a postdoc at the Institut national de la recherche agronomique, France, senior research associate positions at the National Institute for Medical Research/University of Cambridge and Erasmus University Rotterdam, and as a senior scientist at the Sars International Centre for Marine Molecular Biology, Norway.

[4] She remained here for nine years, notably contributing to research into the role of a calcium-dependent protein kinase in the life cycle of Plasmodium berghei with the lab of Oliver Billker.

[1][2][3][13] A genetic knock-out could not be generated for half of the genes, suggesting a potentially essential function in the life of the parasite, and six others were found to play important roles in sexual development and transmission.

[14] Genomic analysis for protein orthologues and genetic manipulation continues to play a major role in Tewari's work, including the 2015 discovery of malarial cyclins and their importance in development of the oocyst form in the mosquito.

[15][16][17] Tewari's work has been accomplished in collaboration with many notable malariologists including Anthony Holder, Robert Sinden and Maria Mota.