Table 1. Cross-packaging rates.

Cells/phage coat	Kn	Cm	Kn, Cm
A527/IKe coats	A	B	C
K19/f1 coats	D	E	F
K1037/either coat	G	H	I

Cross-packaging rates were calculated with infections of the three cell types and three antibiotic treatments using the following formulae: f1 genomes in IKe coats = B/(A + B), and IKe genomes in f1 coats = D/(D + E). Rates of copackaging were calculated for each coat type: both genomes in IKe coat = C/(A + B + C), and both genomes in f1 coat = F/(D + E + F). Total copackaging rates were calculated in cells with both pili as the proportion of infections transmitting both genomes at MOIs <10^-4, I/(G + H + I).