• The SFTPA1 and SFTPA2 haplotypes 6A 2 , 1A 0 and 6A 2 to 1A 0 , and the SFTPD-SFTPA1-SFTPA2 haplotype C-6A 2 to 1A 0 are associated with a protective role against the development of Communityacquired pneumonia (CAP).