The cluster 1 type VI secretion system is a major virulence determinant in Burkholderia pseudomallei. by Burtnick, M, Brett, P, Harding, S, Ngugi, SA, Ribot, W, Chantratita, N, Scorpio, A, Milne, T, Dean, R, Fritz, D, Peacock, S, Prior, J, Atkins, T, Deshazer, D