BACTERIOPHAGES ARE THE MOST UBIQUITOUS “microorganisms on Earth … (i) the total number is estimated to be 10(30)-10(32) phage particles or plaque-forming units (PFU); (ii) within the United States, each person sheds approximately 3 x 10(9) PFU of coliphages per day; (iii) 1 ml of nonpolluted water often contains as many as 2 x 10(8) PFU of phages.”
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