A recent study in 800 blood donors from Mexico reportedly found that 59% of donors were reactive for anti-dengue virus IgG, and 0.71% was reactive for anti-brucella serology, without mentioning whether any patient showed common sero-positivity.[15] Moreover, none had clinical features of acute brucellosis or dengue fever, while only 2% of the overall samples were reactive for anti-dengue virus IgM antibodies. The gene discussed is CD40LG; the disease is dengue disease.