Today my horses blood test came back and he has Lyme (as expected). I called the vet that drew blood for the test and asked if it was acute or chronic. Her response was a quick "both" and she made it clear that she didn't have time to explain further. From my understanding, acute means the horse is in the early stages of the infection and chronic means It's been in the horses system for a while... but I could be wrong. Here's the description of the two from the test done on him:
OspC – has been found to be a valuable indicator of early infection with B. Burg- dorferi. Antibodies to OspC can be detected as early as 3 weeks after infection. Anti- bodies to OspC start to decline after 7-11 weeks and become undetectable by 4-5 months after infection 12.
OspF – is an indicator of chronic infection. Antibodies to OspF are detectable by 5-8 weeks after infection and are maintained at high levels afterwards. Researchers at Cornell observed a very high agreement between antibodies to OspF and C6 as robust markers for infection 12. Horses with positive antibody values to OspF and negative antibody values to OspC are considered to be infected with B. Burg- dorferi for at least 5 months
....So what would being positive for both mean? He's getting the same treatment regardless, but it's really confusing me.