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A 4-year-old male is brought to a clinic because of a 1-week history of fever, cough, and runny nose and a 2-day history of intense coughing spells that last 1 to 2 minutes, occasionally followed by vomiting and dry heaving. His mother says he has not received any immunizations. Temperature is 38.5\u00b0C (101.3\u00b0F). WBC count is 22,000\/mm\u00b3 with 60% lymphocytes.<\/p>\n
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Which of the following pathogens is the most likely cause of this patient\u2019s symptoms?<\/strong><\/p>\n A)\u00a0Bordetella pertussis<\/em><\/p>\n B)\u00a0Corynebacterium diphtheriae<\/em><\/p>\n C)\u00a0Haemophilus influenzae<\/em><\/p>\n D) Measles virus<\/p>\n E)\u00a0Streptococcus pneumoniae<\/em><\/p>\n <\/p>\n <\/p>\n Check the answer below \ud83d\udc47<\/p>\n .<\/p>\n .<\/p>\n .<\/p>\n .<\/p>\n .<\/p>\n .<\/p>\n .<\/p>\n .<\/p>\n <\/p>\n The correct answer is: A) Bordetella pertussis<\/em>.<\/strong><\/span><\/p>\n <\/p>\n <\/p>\n<\/div>\n Initial coldlike symptoms followed by intensive coughing spells are consistent with\u00a0whooping cough,<\/b>\u00a0or\u00a0pertussis. There is\u00a0leukocytosis\u00a0with lymphocytic dominance, as seen here. Initially resembling an upper respiratory infection (catarrhal phase), the infection progresses into the paroxysmal phase, which is characterized by distinctive forced intake of breath, or whoops. This child is currently in the paroxysmal phase.<\/p>\n Disease Diagnosis:\u00a0Bordetella pertussis<\/i><\/b><\/p>\n Whooping\u00a0cough\u00a0is caused by the\u00a0gram-negative\u00a0bacterium\u00a0Bordetella pertussis,<\/b>\u00a0and infection is vaccine-preventable. The\u00a0DTaP vaccine\u00a0contains acellular pertussis\u00a0antigens; the \u201c<\/em>aP\u201d component of the\u00a0vaccine\u00a0is several\u00a0B pertussis<\/i>\u00a0toxins and filamentous\u00a0hemagglutinin.<\/p>\n The other choices are incorrect:<\/p>\n <\/p>\n<\/div>\n<\/div>\n<\/div>\n When you sign up for a free account, you\u2019ll have access to\u00a0Rx360+<\/a><\/strong> for the first five days after sign-up. Take advantage of that time to test-drive the most comprehensive study system on the market and see the difference we can make in your studying.<\/p>\n
\nHigh-Yield Summary<\/h3>\n
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Step 1: Disease Diagnosis<\/strong><\/h3>\n
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