PNEUMABORT-K^® + 1b is labeled for use in pregnant mares, and to aid in the prevention of abortion due to equine herpesvirus Type 1 (EHV-1) infections, and to aid in the prevention of respiratory disease caused by EHV-1p and EHV-1b in healthy horses 9 months of age and older.

In the fifth, seventh and ninth months of gestation, mares need a vaccine labeled to help protect against abortion caused by EHV-1. In fact, pregnant mares have more than four times greater risk of abortion due to EHV-1 when not vaccinated.