Suvaxyn M. hyo - Parasuis Uses For the active immunisation of pigs to reduce lung lesions caused by Mycoplasma hyopneumoniae and to reduce lesions and clinical signs caused by Haemophilus parasuis serotypes 4 and 5. Onset of immunity against Mycoplasma hyopneumoniae has been demonstrated one week after second vaccination. Onset of immunity against Haemophilus parasuis serotypes 4 and 5 has been demonstrated 3.5 weeks after second vaccination. Duration of immunity studies indicate that the vaccine protects for 6 months after the second vaccination against Mycoplasma hyopneumoniae and Haemophilus parasuis serotypes 4 and 5.