Project – Prevalence and Determinants of Malaria Parasitaemia Among Pregnant Women Attending Antenatal Clinics

CHAPTER ONE

INTRODUCTION

1.1 Background of the Study

Malaria remains one of the most significant public health challenges globally, particularly in sub-Saharan Africa where the burden is disproportionately high. According to the World Health Organization (WHO), malaria accounts for substantial morbidity and mortality, with pregnant women and children under five years being the most vulnerable groups. Pregnancy lowers immunity, making women more susceptible to malaria infection, which can result in serious health consequences for both the mother and the unborn child.

Malaria parasitaemia refers to the presence of malaria parasites in the blood, typically caused by Plasmodium falciparum, the most prevalent and deadly malaria species in Africa. During pregnancy, malaria parasitaemia is associated with adverse outcomes such as maternal anemia, low birth weight, preterm delivery, intrauterine growth restriction, and even maternal and neonatal mortality. The placenta provides a favorable environment for parasite sequestration, further increasing the severity of infection in pregnant women.

Nigeria bears a significant proportion of the global malaria burden, contributing to a high percentage of malaria cases and deaths annually. Despite various interventions such as the distribution of insecticide-treated nets (ITNs), intermittent preventive treatment in pregnancy (IPTp), and improved diagnostic and treatment strategies, malaria remains endemic. Pregnant women attending antenatal clinics (ANCs) represent a critical group for malaria surveillance and intervention, as ANC visits provide opportunities for early detection, prevention, and management.

The prevalence of malaria parasitaemia among pregnant women varies widely depending on several factors including geographical location, season, socio-economic status, level of education, parity, and access to healthcare services. In urban centers like Lagos, factors such as overcrowding, poor sanitation, and inconsistent use of preventive measures may contribute to sustained transmission. Additionally, behavioral factors such as non-compliance with IPTp and improper use of ITNs can influence infection rates.

Determinants of malaria parasitaemia in pregnancy are multifaceted. Biological factors such as age and parity play a significant role; primigravidae (first-time pregnant women) are generally more susceptible due to lack of acquired immunity. Environmental factors such as proximity to stagnant water and poor drainage systems also increase exposure to mosquito vectors. Socio-economic determinants including income level, education, and occupation influence access to preventive tools and healthcare services. Furthermore, healthcare system factors such as quality of antenatal care, availability of preventive drugs, and health education impact malaria control outcomes.

Lagos University Teaching Hospital (LUTH), being one of the foremost tertiary healthcare institutions in Nigeria, serves a diverse population and provides comprehensive antenatal services. Studying the prevalence and determinants of malaria parasitaemia among pregnant women attending LUTH offers valuable insights into the effectiveness of existing malaria control strategies and highlights gaps that need to be addressed.

Given the persistent burden of malaria despite ongoing interventions, there is a need for continuous evaluation of its prevalence and associated risk factors among vulnerable populations. Understanding these determinants is essential for designing targeted interventions, improving maternal health outcomes, and reducing the overall burden of malaria in Nigeria.

1.2 Statement of the Problem

Malaria in pregnancy continues to pose a serious public health concern in Nigeria, despite numerous control measures implemented over the years. Pregnant women remain highly vulnerable due to reduced immunity, and malaria parasitaemia during pregnancy contributes significantly to maternal and neonatal morbidity and mortality. This situation persists even in urban settings like Lagos, where access to healthcare services is relatively better compared to rural areas.

One of the major challenges is the inconsistent prevalence of malaria parasitaemia among pregnant women attending antenatal clinics. While some studies report declining trends due to improved interventions, others indicate sustained or even increasing rates of infection. This inconsistency suggests that existing preventive measures may not be uniformly effective or adequately utilized. Factors such as poor adherence to intermittent preventive treatment, improper use of insecticide-treated nets, and delayed healthcare seeking behavior continue to undermine malaria control efforts.

Additionally, there is insufficient understanding of the specific determinants influencing malaria parasitaemia among pregnant women in tertiary healthcare settings like Lagos University Teaching Hospital. Variables such as age, parity, educational level, socio-economic status, environmental conditions, and access to healthcare services may interact in complex ways to influence infection rates. Without a clear understanding of these determinants, it becomes difficult to design effective, context-specific interventions.

Another critical issue is the gap between policy and practice. Although national and international guidelines recommend routine screening and preventive treatment for malaria in pregnancy, implementation challenges such as drug stock-outs, inadequate health education, and poor monitoring systems hinder effectiveness. Furthermore, some pregnant women may lack adequate knowledge about malaria prevention, leading to low uptake of preventive measures.

There is also concern about the potential impact of urbanization in Lagos, which has led to environmental conditions that favor mosquito breeding, such as poor drainage systems and increased population density. These factors may contribute to sustained malaria transmission even in areas with relatively good healthcare infrastructure.

Therefore, the persistence of malaria parasitaemia among pregnant women, coupled with gaps in knowledge regarding its determinants, underscores the need for this study. This research aims to assess the prevalence and identify the key determinants of malaria parasitaemia among pregnant women attending antenatal clinics at Lagos University Teaching Hospital, with a view to informing more effective intervention strategies.

1.3 Research Objective

The main objective of this study is to determine the prevalence and determinants of malaria parasitaemia among pregnant women attending antenatal clinics at Lagos University Teaching Hospital.

1.4 Specific Objectives

1. To determine the prevalence of malaria parasitaemia among pregnant women attending antenatal clinics at LUTH.
2. To identify the socio-demographic factors associated with malaria parasitaemia among pregnant women.
3. To examine the influence of obstetric factors such as age and parity on malaria parasitaemia.
4. To assess the role of preventive measures (e.g., ITNs, IPTp) in reducing malaria parasitaemia among pregnant women.

1.5 Research Question

1. What is the prevalence of malaria parasitaemia among pregnant women attending LUTH?
2. What socio-demographic factors are associated with malaria parasitaemia?
3. How do age and parity influence malaria parasitaemia among pregnant women?
4. What is the effect of preventive measures on malaria parasitaemia?

1.6 Research Hypothesis

H₀: There is no significant relationship between selected determinants (age, parity, socio-economic status, and use of preventive measures) and malaria parasitaemia among pregnant women attending antenatal clinics at Lagos University Teaching Hospital.

1.7 Significance of the Study

This study is significant as it will provide updated data on the prevalence of malaria parasitaemia among pregnant women in an urban tertiary healthcare setting. The findings will be useful to healthcare providers in improving antenatal care services and strengthening malaria prevention strategies.

Policy makers and public health authorities will benefit from the study by gaining insights into the determinants of malaria infection, which can inform targeted interventions and resource allocation. Additionally, the study will contribute to existing literature and serve as a reference for future research in maternal and child health.

1.8 Scope of the Study

This study focuses on pregnant women attending antenatal clinics at Lagos University Teaching Hospital. It examines the prevalence of malaria parasitaemia and its associated determinants, including socio-demographic, environmental, and obstetric factors. The study is limited to women who consent to participate during the study period.

1.9 Definition of Terms

• Malaria Parasitaemia: Presence of malaria parasites in the blood.
• Pregnant Women: Women who are carrying a developing fetus.
• Antenatal Care (ANC): Medical care provided to pregnant women before delivery.
• Parity: Number of times a woman has given birth.
• Intermittent Preventive Treatment (IPTp): Administration of antimalarial drugs at scheduled intervals during pregnancy.
• Insecticide-Treated Nets (ITNs): Mosquito nets treated with insecticides to prevent mosquito bites.

Project – Prevalence and Determinants of Malaria Parasitaemia Among Pregnant Women Attending Antenatal Clinics