Velikovsky, G. phytopathogens ((have been reported almost exclusively to occur in immunocompromised patients or in those with debilitating underlying diseases or undergoing chemotherapy (2, 3, 21). There are no reports of human disease by and other nodule-forming bacteria. The close genetic and antigenic relationship between and nonpathogenic alphaproteobacteria (NPAP) has been revealed by several studies. […]