Combined use of spraying and pour-on formulations
for stable flies control showed an increased likelihood
of seropositivity (OR = 3.2) when used at intervals of up
to 60 days (OR = 3.3). Spraying for tick control (OR = 2.7)
at dipping intervals of 22 and 45 days (OR = 1.1, respectively)
appears to increase the likelihood of seropositivity