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ABSTRACT
This study investigated the bacteriological and fungal evaluation of three commonly used herbal drugs sold in Calabar metropolis. Using standard microbiological analytical protocols, the total bacterial counts ranged from 7.3×103 to 1.2×107cfu/ml while fungal counts ranged from 6.0×103 to 1.1×107cfu/ml. The bacteria isolated includes Bacillus species, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Proteus species, Serratia marcescens and Klebsiella pneumoniae with percentage occurrence of 100%, 66.7%, 66.7%, 66.7% 33.3%, 33.3%, 33.3%, respectively, while the fungal isolates included Fusarium sp, candida albican and Aspergillus niger with prevalence occurrence of 100%, 33.3%, and 33.3%, respectively. The bacterial and fungal isolates showed susceptibility to all the antibiotics except Pseudomonas aeruginosa and Staphylococcus aureus that exhibited moderate resistance to ampicillin and cefoxitin, respectively. There is, therefore, an urgent need for implementation of routine evaluation of herbal medicines and infection control policies in Cross River state and Nigeria in general.
CHAPTER ONE
INTRODUCTION
1.1 Background of the study
Traditional medicine (TM) is the sum total of knowledge, skills and
practices based on the theories, beliefs and experiences indigenous to
different cultures, whether explicable or not (WHO, 2000). TM could be
use in the maintenance of health as well as in prevention, diagnosis,
improvement or treatment of physical and mental illnesses (WHO, 2000).
On the other hand, herbal medicines are plant-derived materials or
preparations with therapeutic or other human health benefits, which
contain either raw or processed ingredients from one or more plants. In
some traditions, materials of inorganic or animal origin may also be
present (WHO, 2000). Herbs include leaves, stems, flowers, fruits,
seeds, roots, rhizomes and barks. The use of herbs for treating various
diseases predates human history and forms the origin of most of the
modern medicine. Long before the advent of modern medicine, herbs were
the mainstream remedies for nearly all ailments (Barakat et al., 2013)
In the last decade, there has been a global upsurge in the use of
traditional medicine (TM) and complementary and alternative medicine
(CAM) in both developed and developing countries. Today, therefore,
certain forms of traditional, complementary and alternative medicines
play an increasingly important role in health care and health sector
reform globally. Hence, the safety and efficacy, as well as the quality
control of traditional medicine and complementary and alternative
medicines have become important concerns for both health authorities and
the public. Man to cure diseases and heal injuries since time
immemorial (Perumalsamy and Ignaglumuthu 2000) has used plants and
herbs. In recent years, interest has been renewed in the use of
medicinal plants, and scientific studies are designed to explain some of
the curative phenomena associated with traditional herbal remedies.
Most drugs utilized by people all over the world are of plant origin
(Mboto, 2009).
Due to its intrinsic qualities, unique and holistic
approaches as well as its accessibility and affordability, herbal
medicines continues to be the best alternative health care available for
the majority of the global population, particularly for those in the
rural areas of developing countries (Mwambazi, 1996).
The bioactive principles and mechanism of action in most herbal
preparations are usually not clearly defined, and there could be
possibilities of interaction with each other in solution. According to
Ogbonnia et al (2010), the quality as well as the safety criteria for
herbal drugs may be based on a clear scientific definition of the raw
materials used for such preparation. As related by the World health
Organization (WHO), herbal medicines are medications prepared from one
or more herbs or plant parts (roots, stem back, seeds and or fruits).
These preparations are often used in different forms including chewing
sticks, herbal pastes, powders, herbal mixtures and suspensions and may
carry a large number of microbes originating from soil usually adhering
to various parts of herbs. Most of these herbal materials are prepared
and sold under unhygienic conditions
(Oluyege et al., 2008).
1.2 Justification for the study
Several studies have reported the isolation of microbes especially in
herbal materials that are prepared and sold under unhygienic conditions
(Oluyege et al., 2008, Ngari et al., 2013). These microbes exist in
these herbal preparations as either potential pathogens or contaminants.
Commonly reported pathogens and contaminants that are associated with
herbal medicine include; Salmonella, Escherichia coli, staphylococcus
aureus, shigella species, fungi, viruses, protozoa, insects and other
gram positive and gram negative strains of bacteria (Ngari et al.,
2013). These organisms have been reported to pose serious health hazards
and risk to consumers of these medicines as well as affect the quality
of the products (Banerjee and Saker, 2003). In Nigeria, herbal medicines
is becoming so popular and there is dearth of information in evaluation
of microbial quality of these medicines especially in Cross River
state.
1.3 Aims and objectives of the research.
This study is aimed at evaluating the bacterial and fungal qualities of
three herbal medicines sold in Calabar metropolis, Cross River state
Nigeria.
The specific objectives of this research were;
1. To determine the bacterial and fungal load present in these herbal medicines.
2. To identify and characterize bacteria and fungi associated with
herbal medicines sold in Calabar metropolis, Cross River state Nigeria,
and
3. To determine the antimicrobial susceptibility profile of isolated bacteria and fungi for the herbal drugs.
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