This study reports the occurrence of a poorly differentiated carcinoma in a captive-born 28 year-old male chimpanzee (Pan troglodytes) who has a familial history of cancer. Pathological findings, surgical interventions, and experimental treatments are discussed.

We report three cases of disseminated hyperinfection by Strongyloides in primates Callithrix jacchus and Callithrix penicillata in captivity and with progressive weight loss syndrome. Histopathological examination revealed severe lesions in lungs, liver, and intestines with the presence of Strongyloides larvae and in a generalized manner, including other organs such as the pancreas and heart.

The brain of a chimpanzee estimated to be 68 years old, the oldest reported so far, has been examined. Pathological analyses revealed the formation of mild tau-positive neuritic clusters and cytoplasmic α-synuclein aggregates, in addition to severe cerebral amyloid angiopathy and diffuse plaques, but no tangle lesions were observed.

This study evaluated the cardiopulmonary effects and anaesthetic depth induced by a propofol infusion rate of 0.8 mg/kg/min in monkeys (Sapajus apella).

This report aims to analyze the experimental monkey shortage generated by the COVID-19 lockdown. The supply capability of the monkey breeding farms is insufficient to meet demand, and the sales prices have skyrocketed since 2018. The contradiction will be further aggravated with import prohibition although the countermeasures suggested.

We describe the presence of fourth molar teeth in the upper jaw of a subspecies (Macaca sinica aurifrons) of the endemic toque macaque of Sri Lanka. Compared to the first three molars, supernumerary ones were smaller by more than 50%, showed four cuspids in the crowns, and had three roots. This observation contributes to knowledge of orthodontic anomalies presence in primate populations while spotlighting

A survey was developed to characterize disease incidence, common pathology lesions, environmental characteristics, and nutrition programs within captive research marmoset colonies.

Whole‐exome sequencing (WES) can expedite research on genetic variation in non‐human primate (NHP) models of human diseases. However, NHP‐specific reagents for exome capture are not available. This study reports the use of human‐specific capture reagents in WES for olive baboons, marmosets, and vervet monkeys.

OKT4 is an important epitope of the CD4 molecular. Amino acid mutations in the CD4V3 region result in deficiency of the OKT4 epitope in human. Here, we firstly reported a case of hereditary deficiency of OKT4 epitope in an inbred Chinese rhesus macaque family. This epitope deficiency is due to cytosine to thymine transition and homozygote at the nucleotide position 793 of CD4 coding sequences, which

This study examines how range size affects intestinal parasite infections, and how such infections affect activity budgets in captive lemurs. There were no differences in parasite richness or intensity attributable to habitat type. However, there was a strong suggestion that parasite loads reduce activity levels.

Nine individual Alouatta caraya and Sapajus cay displaying facial malformations were observed across three sites in Paraguay. Six had cleft lip (with or without cleft palate), and three had malformations of the lower lip. This is the first record of cleft lip and/or palate in the genus Alouatta.

A 30‐year‐old free‐ranging female mountain gorilla (Gorilla beringei beringei) developed a perioral mass that was surgically debulked and diagnosed as malignant melanoma. After tumor recurrence, a canine melanoma vaccine was administered. However, the gorilla died shortly thereafter, and metastases to lymph nodes, lung, liver, and kidney were found post‐mortem.

Herein, we describe a unique case of concomitant angioinvasive pulmonary aspergillosis due to Aspergillus fumigatus and yellow fever in a free‐ranging howler monkey (Alouatta sp). Lung samples were negative for influenza viruses A and B.

The cardiovascular system of owl monkeys has been studied due to frequent postmortem findings of heart disease in asymptomatic animals. The silent aspect and the difficulty of early diagnosis intensify the importance of studying the cardiovascular system in this species.

Biomedical research has recently focused on developing new models of human disease by implementing genome‐editing strategies in non‐human primates (NHPs) to introduce relevant gene mutations. There is a need to establish objective semen evaluation methods to select sires for in vitro fertilization to perform germline editing in embryos.

Primates represent a unique object for biomedical research, in particular in the field of physiology and pathology of the cardiovascular system. Echocardiography is the most important non‐invasive method for the intravital study of the heart structure and function, intracardiac and systemic haemodynamics. The available data on reference values of echocardiographic parameters in primates are limited

Hyporexia and weight loss are important indicators of physical and psychological well‐being in macaque colonies. An FDA‐approved transdermal formulated Mirtazapine (MTZ) shows effectiveness in managing feline hyporexia. This study sought to determine its effectiveness as an appetite stimulant in macaques.

The study evaluated an echo‐guided oocyte recovery technique in owl monkeys. Twelve females were selected for the transabdominal ovum retrieval technique. This procedure collected twenty‐six follicles, of which nine oocytes were recovered, without harm to the animals. The technique is feasible and is a minimally invasive protocol for neotropical primates.

In a captive Macaca mulatta breeding colony, a single family group with 39 animals showed 19 individuals being born with dramatic tail shortening. Through clinical, genealogical, radiographic, and cytogenetic evaluation, it was related to a probable dominant autosomal inheritance of the reduction in the number of distal caudal vertebrae.

Tumors of urinary origin are infrequently reported in non‐human primates. Urothelial carcinoma involving the urinary bladder was diagnosed in an adult female Japanese macaque that extended transmurally to the uterus and cervix. To our knowledge, this is the first report of a primary cystic urothelial carcinoma in a Japanese macaque.

Spontaneous endometriosis is common in women, great apes and Old World monkeys, but rare in New World monkeys. We report on the clinical diagnosis and successful combination of surgical and medical treatment in a case of spontaneous endometriosis in a diabetic hooded capuchin. Addressing this painful condition had a positive welfare impact.

Hyperadrenocorticism is a medical condition caused by the increase in cortisol production by the cortex of the adrenal gland. Although infrequently described in most animal species, its naturally occurring form, called Cushing's syndrome, is the most prevalent endocrinopathy in dogs. Cushing's syndrome is also present in humans and might be confused with the pseudo‐Cushing's syndrome (PCS), rarely

The Callithrix geoffroyi are increasingly present in Brazilian urban areas, where they are vulnerable to health problems. The purpose of this study was a description of hematology and nine blood chemistry parameters of free‐ranging C. geoffroyi.

Colonic volvulus is an uncommon, often life‐threatening condition, in non‐human primates. Twenty‐six cases of colonic volvulus in rhesus macaques (Macaca mulatta) were identified in necropsy records spanning 38 years at the Oregon National Primate Research Center (ONPRC). This report represents the largest collection of colonic volvuli in rhesus macaques.

Alouatta spp. are highly susceptible to yellow fever (YF) infection and develop an often fatal disease. The threat posed by an outbreak started in 2016 leads us to investigate vaccination as a potential tool in preventing YF in non‐human primates (NHP).

Although medroxyprogesterone acetate (MPA) is used commonly as a contraceptive in women and female non‐human primates, its effects on social behavior remain unclear. This study examined whether MPA treatment and introduction of new adult males during the breeding season influence the social behaviors of group‐housed adult female rhesus macaques.

Cryptococcus gattii was diagnosed in two female indoor‐housed rhesus macaques. Gross and histopathologic findings included an isolated pulmonary cryptococcoma in a non‐SIV‐infected macaque and disseminated disease centered on the lungs of an SIV‐infected macaque. Fungal yeast were positive with special stains, and the diagnoses were confirmed with a lateral flow assay and PCR.

Amitriptyline is a tricyclic antidepressant commonly prescribed in humans for pain and sleep disorders and in non‐human primates for self‐injurious behaviors. Here, we report a clinical case on the teratogenic effect of maternal‐fetal amitriptyline exposure.

This study described the hepatobiliary anatomopathological lesions associated with trematode Platynosomum illiciens parasitism in Neotropical primates kept in captivity. In the evaluated organs, we observed portal fibrosis, biliary epithelial hyperplasia, and inflammatory reaction with a predominance of lymphocytes and plasmocytes, and in some cases infiltration of eosinophils and neutrophils.

Toxoplasmosis is a zoonotic disease that affects humans and warm‐blooded animals. This study describes an outbreak of toxoplasmosis in howler monkeys (Alouatta sp.) and survival of capuchins (Sapajus apella), under the same environmental conditions.

Tungiasis is a neglected neotropical disease caused by penetration of Tunga spp. into the skin of the host.

A 13‐year‐old rhesus macaque presented a cervical swelling associated with sudden deterioration of its condition. This mass was surgically removed, and its histopathological examination revealed a stratified squamous epithelium. This appearance has been reported in some case of air sacculitis in others non‐human primate species.

Here we describe a successful surgical management of a distal fibular fracture combined with a tarsocrural luxation and multiple metatarsal fractures in the left foot of a southern brown howler monkey (Alouatta guariba clamitans). We achieved satisfactory outcome by applying intramedullary pinning for each of the bone fractures and closed reduction of joint luxation—kept in place only by bone alignment

Recently, some studies about primates have claimed the importance of the vessels to maintain the muscles working; in fact, the arterial supply could suggest how strenuous the muscular performance is associated to locomotor behavior. The aim of this work was to study the anatomy of the arteries of the forelimbs of different groups of primates to evidence a general arterial model in comparative terms

The aim of study was to evaluate the efficacy of the supraclavicular brachial plexus block technique in Sapajus libidinosus.

The capuchin is a neotropical primate that presents easy reproduction in captivity and is used in scientific research. The objective of this work was to describe the structure and the branching pattern of the brachial plexus of the capuchin and to compare the results with data from the literature for humans, chimpanzees, baboons and Callithrix.

Callithrix jacchus, it is a species highly targeted by wild animal traffickers and, when apprehended, they need veterinary care. For safe therapeutic procedures, knowledge of anatomy is essential, as well as for diagnostic by imaging, good radiographic positioning is essential.

One approach for a functional HIV cure is to prevent transcription from integrated proviral DNA. A critical step in HIV transcription is the Tat protein interaction with the TAR element viral RNA. We tested the strategy of blocking this Tat‐TAR interaction in the SIVmac model.

Through the accumulation of adaptive mutations, HIV‐2 originated from SIVsm. To identify these evolutionary changes, a humanized mouse model recapitulated the process that likely enabled this cross‐species transmission event. Various adaptive mutations arose, as well as increased virulence and CD4+ T‐cell decline as the virus was passaged in humanized mice.

HIV‐1 evolved from SIV during cross‐species transmission events, though viral genetic changes are not well understood. Here, we studied the evolution of SIVcpzLB715 into HIV‐1 Group M using humanized mice. High viral loads, rapid CD4+ T‐cell decline, and non‐synonymous substitutions were identified throughout the viral genome suggesting viral adaptation.

The classification of Saguinus ursulus as a new taxon and the vulnerability of this species highlighted the need for data on its specific morphophysiological attributes. This study used ultrasound to determine the typical characteristics of pelvic‐abdominal structures and organs.

Leptospirosis is an important anthropozoonosis. The study investigated the presence of anti‐Leptospira antibodies and detection of Leptospira spp DNA in the urine as well as the biochemical profile in Neotropical wild primates living in a forest reserve from Southeast São Paulo State, Brazil.

This case reports the successful management of a traumatic diaphyseal femoral fracture in an infant Western chimpanzee (Pan troglodytes verus) from a rescue centre in Sierra Leone using a 2.4‐mm intramedullary pin and two 2.7‐mm String of Pearls™ locking plates. Locking plate use has not been previously described in chimpanzees.

Spontaneous myeloid leukemia is rarely reported in non‐human primates. We report a case of myeloproliferative disorder suggestive of acute myeloid leukemia with intraoral lesions in an olive baboon (Papio anubis). Clinical pathology, radiology, gross examination (pre‐mortem and post‐mortem), histopathology, and immunohistochemistry findings are provided.

Anaesthesia is often required in common marmosets undergoing various procedures. The aim of this study was to evaluate anaesthetic and cardiopulmonary effects of alfaxalone, alfaxalone‐ketamine and alfaxalone‐butorphanol‐medetomidine in common marmosets.

Toxoplasmosis is an important disease affecting captive non‐human primates. The goal of this study was to assess the seroprevalence and pathological findings of toxoplasmosis in different species of captive primates.

The emergence of SARS‐CoV‐2 and the ensuing COVID‐19 pandemic prompted the need for a surveillance program to determine the viral status of the California National Primate Research Center non‐human primate breeding colony, both for reasons of maintaining colony health and minimizing the risk of interference in COVID‐19 and other research studies.

Benign duodenal tumours have very rarely been reported in captive non‐human primates and are also rare in human beings. Brunner's gland hyperplasia has not been fully described in a non‐human primate. Here, we report Brunner's gland hyperplasia in a geriatric chimpanzee, which was an incidental finding during post‐mortem examination.

A 19‐year‐old female chimpanzee (Pan troglodytes) presented for cachexia, acute weakness, hyporexia, icterus, and polyuria. The animal was diagnosed with a hyperglycemic hyperosmolar state, which is a well‐recognized syndrome in diabetic humans that is rarely diagnosed in animals. This case documents an important and likely under‐reported syndrome in non‐human primates.

This case study evaluates the effects of a 4.7 mg deslorelin acetate implant on one male olive baboon (Papio anubis). Implantation induces transient azoospermia after which the subject was able to conceive again. Behavior was also impacted with a decrease in our proxies of aggressiveness and sexual arousal.

Serum biochemistry and ultrasonography can be useful diagnostic tools in evaluating the general health condition of long‐tailed macaques in rescue and rehabilitation centers.