pacific coast tick fever pacific coast tick fever pacific coast tick fever is an infection caused by rickettsia philipii. the disease is spread by the pacific coast ticks. symptoms may include an eschar. it is within a group known as spotted fever rickettsiosis together with rickettsia parkeri rickettsiosis, rocky mountain spotted fever, and rickettsialpox. these infections can be difficult to tell apart. pacific coast tick fever scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rickettsiales family: rickettsiaceae genus: rickettsia species group: spotted fever group species: r. philipii binomial name rickettsia philipiikato et al. 2010 pacific coast tick fevercausesrickettsia philipii spread by the pacific coast tickdifferential diagnosisrickettsia parkeri rickettsiosis, rocky mountain spotted fever, rickettsialpox