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Chapter one
1.0 Introduction
1.1 Blood culture
1.2 Septicaemia
1.3 Objectives of the research
1.4 Justification
Chapter two
2.0 Literature review
2.1 Septicaemia
2.2 Causes of septicaemia
2.3 Detecting bacteria from the blood in septicaemia
2.4 Factors that predispose to bloodstream infection
2.5 Causative organisms
2.6 Blood culture in septicaemia (sepsis)
2.7 Diagnosis of septicaemia: blood culture
Chapter three
3.0 Materials and methods
3.1 Materials
3.1.1 Materials used
3.1.2 Study area
3.2 Sample collection
3.3 Processing of blood specimens
3.4 Identification of isolates
3.4.1 Bacteria identification
3.5 Biochemical tests
3.6 Antibiotic susceptibility test
3.6.1 Inoculum standardization
Chapter four
4.0 Results
Chapter five
5.0 Discussion, conclusion and recommendation
5.1 Discussion
5.2 Conclusion and recommendations
List of tables
Table 1. Definition and diagnosis of sepsis, severe sepsis and septic shock.
Table 2: Frequency (distribution) and gram reactions of aetiological agents of culture-proven septicaema
Table 3: Polymicrobial aetiology of septiceamia.
Table 4: Evaluation of the efficiency of two blood culture broths in laboratory diagnosis of septicaemia
Table 5: Evaluation of the effect of duration of incubation on the yield of bacteria from blood culture broth for laboratory diagnosis of septicaemia
Table 6: Antibiogram of the gram positive bacteria
Table 7: Antibiogram of the gram negative bacteria
List of figure
Figure 1: prevalence of culture – proven septicaemia according to age and
gender of the subjects
CHAPTER ONE
1.0 INTRODUCTION
Blood is normally sterile in healthy individuals. It is the main transport mechanism connecting all different parts of the body. As it serves as a transport system for oxygen, food materials, waste products and others round the body, it can also carry microbes (Eugene et al., 1998). However, it has no normal flora and the presence of microorganism in it indicates failure of the defence mechanisms to maintain its sterility. In many cases such a failure is transitory and of no clinical importance but in others, it is serious and life threatening. Lymphoid tissue is an important part of the defence system acting as a filter to intercept potentially invasive pathogens as well as being the headquarter of the lymphocytes on which immunity is heavily dependent. This filter system is however liable to clinically significant infections by intercepted pathogen and it is also the primary target for some factors of infection (Douglas et al., 1981). The involvement of blood, lymphatic system and heart in many infections give us the knowledge of the presence of bacteria in the blood.
Various authors have reported bacteraemia immediately after incision of an abscess, tonsillectomy and tooth extraction (Fischer et al., 1941; Murry et al., 1941). Robert et al. (1997) described bacteraemia as a transitory disease in which bacteria present in the blood are usually eliminated from the vascular system by the reticulo endothelial system with no harmful effect, but in host with reduced immunity, septicaemia results.
The mortality rate varies between 15 and 35%, depending on the age, the underlying condition and the treatment given (Shamson, 1998). Prompt recognition of septicaemia and immediate treatment based on the knowledge of the likely causative organism is essential. Septicemias which are of bacterial origin are caused by myriads of bacteria varying from one locality to another. Many studies on septicaemia in Nigeria have been on neonates and childhood and also retrospective (Dawodu et al., 1980) and there is therefore paucity of information on prospective study on septiceamia in different strata of society in Nigeria.
1.1 BLOOD CULTURE
This is a culture of blood microbiologically that is employed for the detection of diseases which are spreading through the bloodstream. One of such disease is septicemia. This culture of blood is possible because the bloodstream is usually a sterile environment and it is carried out through a laboratory test which will check for bacteria or other microorganisms in a blood sample. Most cultures check for bacteria. A culture may be done using a sample of blood, tissue, stool, urine, or other fluid from the body.
When signs or symptoms of a systemic infection is noticed in a patient, results from a blood culture can verify that an infection is present, and they can identify the type (or types) of microorganism that is responsible for the infection. A good example is when blood tests identifies the causative organisms in neonatal epiglottitis, sepsis, severe pneumonia, puerperal fever and fever of unknown origin (FUO). However, negative growths do not exclude infection. The usual risks of venipuncture and the occurrence of false positive results approximately 3%+ of the time, can lead to inappropriate treatment (Madeo et al., 2003).
1.2 SEPTICAEMIA
Septicaemia is often referred to as either blood poisoning, bacteremia or sepsis, although it could be argued that each of the terms are not entirely accurate, but are often used interchangeably by scientists (Al-Khafaji et al., 2010). Sepsis is not just limited to the blood and can affect the whole body, including the organs.
Septicaemia (another name for blood poisoning) refers to a bacterial infection of the blood, whereas sepsis can also be caused by viral or fungal infections.
Sepsis is caused by an immune response triggered by an infection (Jui, 2011; Deutschman and Tracey, 2014). The infection is most commonly bacterial, but it can also be from fungi, viruses, or parasites (Jui, 2011) Common locations for the primary infection include: lungs, brain, urinary tract, skin, and abdominal organs. Risk factors include young or old age, a weakened immune system from conditions such as cancer or diabetes, and major trauma or burns (CDC, 2014). Diagnosis is based on meeting at least two systemic inflammatory response syndrome (SIRS) criteria due to a presumed infection. Blood cultures are recommended preferably before antibiotics are started; however, infection of the blood is not required for the diagnosis (Jui, 2011). Medical imaging should be done to look for the possible location of infection (Patel and Balk, 2012). Other potential causes of similar signs and symptoms include: anaphylaxis, adrenal insufficiency, low blood volume, heart failure, and pulmonary embolism among others (Jui, 2011).
1.3 OBJECTIVES OF THE RESEARCH
This objectives of this research are to;
- Determine the relevance of blood culture to the diagnosis and treatment of septicaemia.
- Compare the occurrence of Gram positive and Gram negative bacteria in the subjects with culture – proven septicaemia.
- Determine which gender (male or female) is more prone to septicaemia.
1.4 JUSTIFICATION
It is important to ensure that bloodstream infections are diagnosed accurately and that infecting pathogens, their antimicrobial susceptibilities, and the possible primary sources of infection are evaluated thoroughly, to enable optimal targeted antimicrobial therapy. Blood cultures and their microbiological analysis are highly essential and important for the diagnosis and treatment of septicaemia (sepsis). Blood culture is important for early diagnosis and treatment of patients with septicaemia as survival depends on early detection and administration of adequate empirical antimicrobial therapy.
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