Figure 48-2: The distribution of phage pfu's in mice following various routes of administration.  This graph was adapted from data from a 1973 experiment in which germ free mice were inoculated with a single dose of 2X10(12) pfu Lambda phage.  In these experiments oral administration of phage resulted in the detection of a systemic level of phage tissue titers that were 7 to 8 orders of magnitude lower than that achieved by systemic administration of phage (30).