Clinical Scorecard: Clinical Characteristics of Asymptomatic Plasmodium Infections in Migrant Populations
At a Glance
Category
Detail
Condition
Asymptomatic blood-stage Plasmodium infections
Key Mechanisms
Partial immunity from repeated exposure leads to asymptomatic low-density parasitemia; persistent infection can cause anemia, elevated ESR, raised IgM, and splenomegaly
Target Population
Sub-Saharan African migrants relocated to nonendemic countries
Care Setting
Migrant health assessment units and infectious diseases outpatient clinics in nonendemic settings
Key Highlights
10.4% of asymptomatic sub-Saharan African migrants screened were PCR positive for Plasmodium infection.
Plasmodium-infected migrants had higher rates of anemia (21.1% vs 6.1%), elevated ESR (58.1% vs 25.0%), raised IgM (30.5% vs 10.5%), and splenomegaly (25.4% vs 2.5%) compared to uninfected controls.
Antimalarial treatment improved splenomegaly and abnormal laboratory parameters in infected individuals.
Guideline-Based Recommendations
Diagnosis
Use real-time polymerase chain reaction (qPCR) for detection of asymptomatic Plasmodium infections in migrants from endemic areas.
Management
Consider antimalarial treatment for asymptomatic Plasmodium infections to prevent adverse outcomes such as anemia and splenomegaly.
Monitoring & Follow-up
Monitor laboratory parameters including hemoglobin, erythrocyte sedimentation rate (ESR), immunoglobulin M levels, and spleen size before and after treatment.
Risks
Asymptomatic infections may contribute to anemia, hyperreactive malarial splenomegaly, and other complications if untreated.
Patient & Prescribing Data
Asymptomatic sub-Saharan African migrants with PCR-confirmed Plasmodium infection
Antimalarial treatment leads to improvement in splenomegaly and normalization of laboratory abnormalities such as anemia and elevated ESR.
Clinical Best Practices
Screen migrants from malaria-endemic regions for asymptomatic Plasmodium infection using sensitive PCR methods.
Assess for clinical signs such as splenomegaly and laboratory abnormalities even in absence of symptoms.
Treat confirmed asymptomatic infections to reduce risk of complications and improve clinical parameters.
Incorporate malaria screening into migrant health assessments alongside other infectious disease screenings.
by Isabelle Eliasson, Katja Wyss, Rebecca Tafesse Bogale, Sofia Forsblom, Emil Lindquist, Caroline Rönnberg, Magnus Hansson, Soheir Beshara, Irene Nordling, Olof Hertting, Andreas Wångdahl, Anna Färnert
