Milne et al., however, found that the sensitivity of detection in most routine diagnostic laboratories is about 10-fold lower (average 0.01% infected red blood cells, 500 parasites/L)18. malarial antibodies using an enzyme immunoassay kit. The kit (Malaria EIA, Newmarket, UK) uses four recombinant antigens specific for and and with cross-reactivity for Rabbit polyclonal to HLX1 and The kit detects total immunoglobulin antibodies against and and shows 80% cross-reactivity with and 67% with and antigens and by haemoscopy (thin film and thick smear). Results. Italian citizens accounted for 16.8% (69/412) of the whole group of donors examined. We found that 8.7% of the donors who were classified as being at risk of malaria were positive for total immunoglobulin antibodies. Only one Italian citizen resulted positive for the test. The positive candidates were deferred from blood donation. None of the antibody-positive donors was confirmed positive by the immunochromatographic test and by haemoscopy. Conclusion. The introduction of a malarial screening test in the assessment of blood donor eligibility may increase the safety of blood donations, but could further reduce blood availability. If immunological testing were to be accepted nationally as a valid method of assessing the risk of malaria, more than 90% AZD2014 (Vistusertib) of the donors who are currently deferred for 3 years could be accepted 4 months after their last visit to an endemic area, thus increasing the availability of blood Keywords: transfusion-transmitted malaria, enzyme immunoassay, donors risk Introduction Malaria infection is caused by a blood protozoa of the genus Usually malaria is transmitted by the bite of an infected mosquito, but cases of transfusion-transmitted malaria (TTM) have been recorded since 19111. TTM can be acquired through blood components such as red cell concentrates, platelets2, leucocytes3, fresh-frozen plasma4 and frozen red blood cells5. TTM is very rare in countries in which malaria is not endemic, such as Italy, where the incidence of TTM ranges from 0 to 2 cases per million blood donations6. Nevertheless, this disease has an impact on the resources of Italian Blood Banks because over the last few years more and more prospective donors have been coming from malaria endemic areas either as tourists, immigrants or workers. Malaria is currently re-emerging in many areas where it had been eradicated in the past and, consequently, the number of subjects coming from malaria areas offers risen. In Italy, the deferral criteria for blood donors at risk of malaria are defined from the Decree of the Ministry of Health dated March 3rd, 2005, published in the N.85, April 13th, 20057. Whole blood donation is definitely deferred for 3 years in potential donors who lived the 1st 5 years of their existence in malaria endemic areas, and for 6 months in potential donors returning from an endemic area and those who have been infected previously. Italian laws comply with current Western regulations8, which require a deferral period of 6 months or 3 years depending on the risk of exposure for prospective blood donors at risk. This period may, however, be reduced to 4 weeks if an immunological or molecular genomic test is bad at each donation. This provision has not been used in Italy. Given that instances of TTM have been recorded in blood donors who have been deferred for 3 years but not tested9, the Immunohaematology and Transfusion Centre of Milan decided to expose immunological screening for donors at risk of malaria. Materials and methods Materials AZD2014 (Vistusertib) From February 1st, 2007 to June 30th, 2010, AZD2014 (Vistusertib) we evaluated 412 blood donors at risk of malaria, because of having lived inside a malarial area during the 1st 5 years of existence or for more than 6 consecutive weeks, for malarial antibodies using an enzyme immunoassay (EIA) kit. Blood from each donor enrolled was collected by venipuncture into a 3 mL serum tube with no additives. For each donor identified as becoming positive from the EIA, some whole blood drops were collected by pricking the finger of the donor, and examined by optical microscopy. Another 3 mL of whole blood were collected by venipuncture into.