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Several incidents of deaths/illness due to anesthetic procedures have occurred in the marmosets. 1)On September 10, 2019 , a male Marmoset (844 835 601) underwent a 6 hour surgical procedure. Multiple I.V. catheterization attempts were made prior to successful placement with visible bruising at the saphenous catheter site and lateral thigh muscle. One massage of hind limbs was recorded during the surgery. Upon recovery it was noted that his left rear leg was swollen and he was dragging it and lacked a pain response. The PI and the on-call veterinarian were notified within one hour of extubation and the veterinarian was to check on him in the am. On 9/11/2019, the marmoset was found dead at the first check in the morning at ~ 8 am. Deep vein thrombosis was confirmed at necropsy. 2)On January 29, 2020, a male Marmoset(844 837 257) was anesthetized and the technician remembered that he was particularly difficult to intubate. During recovery an increased respiratory rate was noted and the animal developed respiratory difficulties resulting in euthanasia on 2/1/2020. Necropsy revealed acute laryngitis/pharyngitis due to trauma of intubation as cause of death. A marmoset (844 840 303) who had surgery 10/23/2019 also showed respiratory difficulty after recovery from surgery which gradually resolved. Procedures like intubation, anesthesia support, and I.V. catheterization when not performed adequately can cause harm, injury and death to the animals. Equipment utilized and care delivered including intubation and catheterization before, during and after procedures must be in accordance with current established veterinary medical and nursing procedures. Corrected prior to inspections.