Background: Recent observations from different parts of world has confirmed the existence of severe P.vivax malaria, however, the reports of severity in children are scanty.Methods: This prospective study was conducted on 168 admitted children of malaria during January 2011 to December 2011 in in medical college hospital, Bikaner (Northwest India). Species diagnosis was done by peripheral blood smear and rapid diagnostic test. Further confirmation of severe P.vivax monoinfection was done by polymerase chain reaction revealing 96.38% accuracy. Severe malaria was defined strictly on WHO criteria (2000).Results: The proportion of P.falciparum,P.vivax, and mixed infection (P.falciparum and P.vivax) was 34.5%, 53.6%, and 11.9%, respectively. Severe malaria was detected in 47.6% (80/168) children, with the risk greatest among P.vivax monoinfection (62.2% [56/90]) compared with P.falciparum, either alone (34.5% [20/58]; OR = 3.1 [95% CI = 1.49-6.62], p = 0.001) or mixed infections (20% [4/20]; OR = 6.59 [95% CI = 1.85-25.64]). In children < 5 years of age, the proportion of severe malaria attributable to P.vivax rose to 69.2% (18/26) compared with 26.9% (7/26) of P.falciparum(OR = 6.12 [95% CI = 1.58-24.79], p = 0.005) and 3.85% (1/26) of mixed infection (OR = 56.25 [95% CI = 6.00-1322.27], p < 0.0001). The proportion of children having severe manifestations, which included severe anemia, thrombocytopenia, cerebral malaria, acute respiratory distress syndrome, hepatic dysfunction, renal dysfunction, abnormal bleeding, shock and hemoglobinuria, was significantly high in association with P.vivax monoinfection in 0-5 year age group, while the same was significantly high in association with P.falciparum monoinfection in 5-10 year age group. Similarly P.vivax monoinfection had greatest propensity to cause multiorgan dysfunction in 0-5 year age group (38.9% [7/18], p < 0.01) in comparison to P.falciparum monoinfection, which had similar propensity in 5-10 year age group (66.7% [6/9],p = 0.03). The case fatality rate of severe P.vivax monoinfection was 2.8% versus 2.6% of severe P.falciparum monoinfection (p = 1.0).
Conclusion:This study reaffirms the evidence of severe P.vivax monoinfection in children in Bikaner having almost similar spectrum to P.falciparum monoinfection.