ࡱ> vxu <bjbj 4txx4LL|@dON0MMMMMMM$O5RMMk Nkkk~MkMkkf=0@pmR>$MN0ON>@)SO)SH@k@ LMMkON)SL* v:   Chapter 20: Infectious Diseases Affecting the Cardiovascular and Lymphatic Systems 20.3 Cardiovascular and Lymphatic System Diseases Caused by Microorganisms A. Endocarditis 1. Inflammation of the endocardium 2. Usually refers to an infection of the valves of the heart 3. May be acute and subacute, with similar symptoms (in subacute the symptoms develop more slowly and are less pronounced) A) Fever, anemia, abnormal heartbeat, and sometimes valve stenosis (sometimes symptoms similar to heart attack) 4. Acute bacterial endocarditis is usually caused by Staphylococcus aureus, Streptococcus pneumonia, Streptococcus pyogenes, and Neisseria gonorrhoeae 5. Subacute bacterial endocarditis is usually caused by less virulent bacteria such as Streptococcus sanguis, Streptococcus oralis, Streptococcus mutans, Streptococcus viridians, and Staphylococcus epidermidis A) Normal body flora that gain entrance to bloodstream through dental procedures/infections or other trauma B. Septicemias (blood poisoning) 1. Occurs when organisms are actively multiplying in the blood 2. Many different bacteria and a few fungi can cause this condition 3. Symptoms often result from bacterial toxins or the bodys own cytokine response A) Fever prominent symptom B) Patient appears very ill, may have an altered mental state, shaking chills, and gastrointestinal symptoms C) Often exhibits increased breathing rate and respiratory alkalosis D) Low blood pressure C. Toxic Shock Syndrome (systemic infection) 1. A series of blood infections affecting the kidneys, blood, and muscles resulting in death in a matter of hours a) Initially see high fever, vomiting, diarrhea, sore throat, and muscle pain b) Within 48 hours can progress to severe shock with kidney & liver damage and death 2. Usually caused by S. aureus but can also be caused by S. pyogenes 3. Usually affects post-pubescent (menstruating) females but can also affect children, males, and non-menstruating women D. Plague 1. Sometimes called Black death, it was responsible for the death of approximately 1/2 to 2/3 of the population of Europe from 1346-1350 2. Once a pandemic it is now endemic only in areas with high rodent populations including the Western U.S. 3. A zoonotic disease caused by Yersinia pestis A) An enterobacterium with many virulence factors 1) Pla protease that destroys C3b and C5a 2) Yops proteins that interfere with phagocytosis 3) PsaA an adhesin that plays a role in attachment to host cells 4. It is transmitted to humans by fleas (bubonic plague) A) Enters the lymph and is filtered by a lymph node B) Infection causes inflammation and necrosis of the node C) Results in a swollen lesion called a bubo, usually in the groin or axilla D) Often will spread via the bloodstream resulting in necrosis & blackening of other tissues and eventually death 5. There is also person-to-person transmission (pneumonic plague) resulting in a severe lung infection that can cause sepsis 6. Untreated bubonic plague has a mortality rate of 50-80% and untreated pneumonic plague is fatal at almost 100% E. Tularemia 1. Sometimes called rabbit fever, it has been associated with outbreaks of disease in wild rabbits 2. A zoonotic disease caused by Francisella tularensis A) Pathogen of concern on the lists of bioterrorism agents 3. Transmitted by wild animals to human by exposure to the animals blood or by insects A) Risk is mainly to hunters, trappers, and game wardens who frequently handle wildlife B) Ticks are the most frequent vector 4. Symptoms: headache, backache, fever, chills, malaise, and weakness 5. Further symptoms tied to the portal of entry: ulcerative skin lesions, swollen lymph glands, conjunctival inflammation, sore throat, intestinal disruption, pulmonary involvement F. Lyme Disease 1. Causitive agent is Borrelia burgdorferi; carried by ticks 2. Symptoms of the disease can be divided into three stages: A) Days to weeks after tick bite A bulls-eye skin rash develops (present in 2/3 of all cases) as well as fever, headache, stiff neck, and dizziness B) 2-8 weeks after initial symptoms heart disrhythmias leading to dizzy spells and fainting 1) Nervous system involvement can result in paralysis of the face, severe headache, emotional instability, fatigue, and impairment of the nerves of the limbs C) Arthritis that occurs in 60% of patients usually at 6 months after initial symptoms D) Disease is nonfatal 3. Treatment A) Many antibiotics including ampicillin are effective against the infection B) Treatment of early infections often brings full recovery C) Late-stage treatment often reduces the symptoms though they may not go away completely G. Infectious Mononucleosis 1. Commonly called mono or Kissing disease A) The incidence of mono is highest during the age of 15-24 2. Majority caused by Epstein-Barr virus (EBV); most of the remainder caused by cytomegalovirus (CMV) A) DNA viruses of the herpesvirus family 3. After a 30-50 day incubation period, the virus establishes an infection of the B- lymphocytes 4. Symptoms include fatigue, high fever, sore throat, and enlargement of the lymph nodes (lymphadenopathy) 5. Certain strains of EBV can cause cancer of the B-cells = Burkitts lymphoma H. Hemorrhagic Fever Diseases 1. Although different in their severity, the viruses all work in the same basic way A) All result in extreme fevers with some also seeing internal or external hemorrhaging B) The virus enters the bloodstream causing capillary fragility and disrupting blood- clotting systems leading to localized bleeding and shock 2. Yellow Fever (arbovirus) A) Symptoms include headache, high fever, jaundice, and black vomit 3. Dengue Fever (arbovirus) A) Usually mild but sometimes it can progress to dengue hemorrhagic shock syndrome which can be lethal B) Causes severe pain in muscles and joints; a.k.a. breakbone fever 4. Ebola and Marburg (filoviruses) A) Related viruses, cause similar symptoms B) Patients bleed from their orifices, mucous membranes, and experience massive internal and external hemorrhage C) No effective treatment; mortality rate of 25-100% depending on the strain of the virus 5. Lassa Fever (arenavirus) A) Most cases asymptomatic B) In 20% of the cases, a severe hemorrhagic syndrome develops I. Nonhemorrhagic Fever Diseases 1. Brucellosis A) Also called Bangs Disease or Undulant Fever B) On the CDC list of possible bioterror agents C) Caused by Brucella melitensis D) Transmitted to humans via the blood of infected animals or contaminated animal products 1) Commonly via occupational exposure in slaughter houses, meat-packing plants, and veterinary practices 2) A small number of cases have been traced to drinking contaminated milk E) Bison, elk, and moose are common carriers and can transmit the bacteria to cattle when grazing land is shared F) The bacteria enters through damaged skin or mucus membranes of the digestive tract, conjunctiva, and respiratory tract G) Bacteria is carried into the bloodstream by phagocytic cells, creating focal lesions in the liver, spleen, bone marrow, and kidney 1) Often accompanied by fluctuating pattern of fever accompanied by chills, profuse sweating, headache, muscle pain and weakness, and weight loss 2. Cat Scratch Disease (CSD; cat scratch fever) A) A zoonotic infection primarily seen in children ages 2-14 B) Causative agent is Bartonella henselae C) Transmitted to humans via bites or scratches by cats, especially kittens 1) About 40% of cats harbor the pathogen D) Symptoms usually present 1-2 weeks after the bite or scratch 1) Initially see a cluster of small papules at the site of inoculation 2) Followed by swelling of lymph nodes which can become pus-filled 3) Only about 1/3 of patients actually experience a fever E) Will usually resolve itself without treatment but multiple antibiotics are effective against the pathogen 1) Thorough cleaning of a cat bite or scratch will usually prevent the infection 3. Rickettsial Infections A) Require insect vectors and target small blood vessels in the body 1) Symptoms often include a rash, edema, and hypotension B) Diseases caused by Rickettsia 1) Epidemic typhus (louse-borne typhus) a) Caused by Rickettsia prowazekii b) Infection generally occurs following contact with louse feces c) Not common in U.S. 2) Endemic typhus (murine typhus) a) Caused by Rickettsia typhi b) Rats and mice are carriers and it is passed to humans via infected fleas c) Is the most severe and most reported rickettsial illness occurring primarily in the southwest U.S. 3) Rocky Mountain Spotted Fever a) Caused by Rickettsia rickettsii b) In spite of its name the disease is seen most often in the east and southeast c) The tick is the most common vector C) Treatment of Rickettsia infections often includes the use of tetracyclines J. Malaria 1. The worlds dominant protozoan disease A) It is the most widespread of all infectious diseases but malaria is now confined to impoverished warm regions of the world where it survives despite the massive eradication programs 1) There are an estimated 250 million people infected annually with almost 1 million deaths 2. Caused by multiple members of the Plasmodium family A) P. malariae, P. vivax, P. falciparum, & P. ovale 3. Primarily spread by mosquitoes 4. Parasite development is divided into 2 distinct phases A) Asexual phase in human host 1) Begins when an infected mosquito bites a human 2) Before drawing blood, the mosquito injects saliva containing the parasite into the blood to prevent clotting 3) The parasite moves into the liver where it divides within the hepatocytes 4) The hepatocytes eventually burst releasing the parasite into the circulation 5) The parasite then moves into the RBC and feed on the hemoglobin and reproduce until the RBC bursts B) Sexual phase in mosquito host 1) A mosquito draws infected blood into its stomach 2) The parasite reproduces and moves to the salivary glands and waits to be passed on to a human host 5. Initial symptoms include violent chills, fever, and sweating often followed by the patient feeling better for short periods 6. Hemolytic anemia, ruptured organs, and pulmonary failure may result in more serious cases 7. Treatment often involves the use of quinine (a plant extract) or chloroquine K. HIV infection and AIDS 1. Human Immunodeficiency Virus (HIV) retrovirus A) Hybrid virus genetic sequences from two separate monkey SIVs 2. HIV infection A) Symptoms directly tied to two things 1) The level of virus in the blood (>100,000) 2) The level of CD4 (helper T) cells in the blood (<200 or <14%) B) Symptoms 1) Initial infection causes vague, mono-like symptoms that soon disappear 2) Within days, about 50% of the T helper cells with memory for the virus are destroyed C) Symptoms are often followed by a period of asymptomatic infection that varies in length from 2 to 15 years 1) During this period the number of T cells in the blood is steadily decreasing 2) Once T cells reach low enough levels, symptoms of AIDS ensue 3. Acquired Immunodeficiency Syndrome (AIDS) A) AIDS is the end stage of disease caused by the human immunodeficiency virus (HIV) 1) Initial symptoms of AIDS include fatigue, diarrhea, weight loss, and neurological changes 2) Other symptoms are seen as the disease progresses a) Opportunistic infections a leading cause of death b) Pronounced wasting of body mass c) Protracted fever, fatigue, sore throat, and night sweats d) Lesions in the brain, meninges, spinal column, and peripheral nerves e) Multiple types of cancer i) The most common types are Kaposi sarcoma and non-Hodgkin lymphoma 4. Worldwide about 4-5 million new HIV infections are reported each year with 2-3 million deaths; it has resulted in 25 million deaths since 1981 5. HIV is carried in blood, semen, and in vaginal secretions and is spread primarily through sexual intercourse, sharing needles, and from mother to newborn 6. STDs which result in chancre formation (herpes & syphilis) facilitate the spread of the virus L. Elephantiasis (lymphatic filariasis) 1. Caused by Wuchereria bancrofti 2. Transmitted from human to human via mosquitoes 3. 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