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ABSTRACT
Infectious and parasitic diseases in zoo animals affect their welfare, reproduction and
longevity and pose health threat to researchers, visitors and staff of zoological garden. The
aim of this study was to assess biosecurity and determine occurrence of Salmonellae, ecto-
and gastro-intestinal parasites (GIP) in Kano zoological garden, Nigeria (KZG). A total of
388 samples were collected from 161 wild animals by non-random sampling method. The
distribution of the samples was: one hundred and eleven cloacal swabs from wild birds; one
hundred and seventy faecal samples from carnivores (28), herbivores (62), non-human
primates (35) and wild birds (45); one hundred and seven ectoparasite (EP) samples from
herbivores (2), carnivores (53), non-human primates (27) and wild birds (25). Conventional
biochemical tests were used to identify Salmonella species after which suspected/confirmed
isolates were subjected to antimicrobial sensitivity test using a panel of 12 antimicrobial
agents. Simple flotation technique and microscopic examination methods were used to
identify gastro-intestinal parasite eggs/oocysts and ecto-parasites respectively. Of the total
faecal and rectal swab samples (196) examined for Salmonella, seven isolates (3.57%) were
confirmed; two were from lions (Panthera leo), one each from bush buck (Tragalophus
scriptus), Cape eland (Tragalophus oryx), Egyptian geese (Alopochen aegyptiacus), parrot
(Psittacus erithacus) and crested porcupine (Hystrix cristata) respectively. The occurrence of
Salmonella was 7.14% in carnivores, 5.76% in herbivores and 2.7% in wild birds while the
overall occurrence in KZG was 4.8%. All the Salmonella isolates (100%) showed multidrug-
resistance (MDR) pattern with resistance profile of 3-4. However, none of the isolates
showed mild, extensive or pan drug resistance. Eggs and oocysts were identified from 85
faecal samples: Ascaris from tortoise; Enterobius from chimpanzee; Strongyle from tantalus,
red patas and tortoise; Taenia from lion; Toxocara from lion, Nubian vulture and mangoose;
vi
Trichurid from baboon, buffalo, porcupine, red patas and tantalus; Coccidia from peacock
and red patas; and Isospora from lion and mangoose. The occurrence of GIP egg was highest
among non-human primates (37%) and lowest among wild birds (13.5%). Among
herbivores, the occurrence was 26.9% while in carnivores was 14.28%. The gastro-intestinal
parasite richness count (GIPRC) among carnivores, herbivores, non-human primates and
wild birds was 5/3, 5/3, 7/4 and 4/2 respectively. The overall occurrence of GIP eggs and
oocysts in KZG was 63% and GIPRC was 21/8. Bug (Cimex lectularius) was identified from
baboon and red patas; and Rhipicephalus sanguineus tick from buffalo and common jackal.
The occurrence of EP and ecto-parasite richness count (EPRC) among buffalos, common
jackal, baboon, red patas and spotted eagle owl were 100% and 2/3; 33% and 2/3; 25% and
1/3; 16% and 2/3; 20% and 1/3 respectively. Of the nine components of zoo biosecurity
assessed in KZG, quarantine practices had highest biosecurity risk (100%) and risk level
(2.6) while work and hygiene practices for staff and visitors poses lowest biosecurity risk of
58.3% and risk level of 2.0. Audit and validation of biosecurity practices in property
management and wildlife sections revealed breaches in traffic control, isolation and
sanitation in many sections (70%) of KZG.
1.0 INTRODUCTION
1.1 Background to the Study
Infectious disease within zoo collection impacts on individual health and welfare, and can have long
term impacts on reproduction, longevity, behaviours, population and species viability (Reiss and
Woods, 2011). Subclinical and chronic diseases can exert their effects for years and even decades.
Sickness, death and reproductive failure in collection animals leads to greater costs (husbandry,
veterinary care, acquisition), and reduces the financial viability of the zoo as a business. Infectious
diseases like salmonellosis that may spread to humans or domestic animals can have serious social,
economic and ethical costs (Reiss and Woods, 2011).
Salmonellosis is caused by Salmonella species and characterized clinically by one or more of three
major syndromes: septicaemia, acute and chronic enteritis (Kahn and Line, 2005). The portal of
infection in Salmonellosis is almost always the mouth, so that the severity of the disease in an
individual or of an outbreak in a group depends on the degree of contamination and environmental
conditions; temperature and dryness, which determine the survival time of Salmonellae (Radostits,
1997). The response to infection with Salmonella varies depending on the size of the challenging
dose and the immunological status of the animal (Radostits, 1997).
Parasitism is an important environmental component of the life cycle of most organisms including
birds and wildlife (Loye and Zuke, 1991). While ecto-parasites live on the surface of the host‟s
body, endo-parasites are found within the body of the host (Narula, 2013). Helminth parasites like
Trichuris and Strongyle are significant pathogens of wildlife and responsible for unthriftness,
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