Infectious Disease

Latest News


CME Content


Case 1:

A painful scalp eruption of 4 days’duration brings an 81-year-old man toyour office. He has taken a lipid-loweringagent and an antihypertensivefor years but has not started any newmedications recently. One week earlier,he had a haircut. He denies recenttrauma to the scalp.

A 59-year-old woman presents with generalized facialswelling and dyspnea that has progressed graduallyover the past month. The patient also reports a sensationof pressure in her neck and ears and swelling of the lowereyelids, neck, upper chest, and upper limbs. The bloodvessels on her upper chest are prominent. A dry, irritatingcough has worsened.

My patient has a test-proven Candida allergy. Because hepatitis B virus (HBV)vaccine contains yeast, another physician would not give it to him. I administereda diluted dose and then a full-strength dose of the HBV vaccine, and the patienthad no adverse reaction.

Look for Traveling Tinea

When you treat a patient for tineacruris (jock itch), always check hisfeet as well.

A 48-year-old African Americanwoman with HIV infection who hadbeen hospitalized several days earlierfor presumed Pneumocystis cariniipneumonia (PCP) is readmittedbecause of worsening dyspnea and atemperature of 38.8oC (102oF).She also complains of painful swellingand erythema on her right arm.Her symptoms have worseneddespite treatment with trimethoprimsulfamethoxazole.

ABSTRACT: The key factor in reducing morbidityand mortality in patients with chronicobstructive pulmonary disease (COPD)continues to be smoking cessation. Newerformulations of nicotine replacementtherapy-a nasal spray and an inhaler-provide rapid delivery of nicotine and maybe appropriate for highly dependent smokers.Bupropion has been shown to improvesmoking cessation rates, either when usedalone or with a nicotine patch. Both theinfluenza and pneumococcal vaccines arerecommended to reduce the morbidity andmortality associated with respiratory infectionsin patients with COPD.

A 55-year-old constructionworker who spends a gooddeal of time outdoors has had occasionalblurred vision and an irritatedeyelid for several days. He has wellcontrolleddiabetes and hypertension.Which of these conditions doyou suspect?

Plague is caused by Yersiniapestis, a gram-negative, nonmotile,nonsporulating bacillus.It is a zoonotic disease, and rodentsare the primary reservoir.Plague can present as bubonic,pneumonic, or primary septicemic disease.Y pestis is usually transmitted tohumans via the bites of infected fleas,causing the bubonic form of the disease.Primary septicemic and secondarypneumonic disease are muchless common. Primary pneumonicdisease results from aerosol exposureto an infected animal or human withplague pneumonia; however, it too hasbecome uncommon as a natural event.Nonetheless, primary pneumonicplague, or a similar illness, is the mostlikely manifestation following a bioterroristattack.1,2 Despite the substantialinvestment by the former Soviet Unionin this agent as a potential weapon,there is little experience from whichto predict the clinical consequencesof intentional aerosolization of thisorganism.

A 51-year-old man presents with aseverely infected leg and 1- to 2-cmlesions on all of his extremities andtrunk; the bases of the lesions aredepressed, atrophic, and scarred.According to the patient, the lesionstypically appear as tender nodulesor pustules, which spontaneouslyburst, drain purulent material, andeventually heal as pictured.

In Dr Sean Eric Koon's Case In Point, "Puzzling Rash in an Older Woman"(CONSULTANT, April 15, 2003, page 629), I agree with his conclusion that thispatient had cutaneous leukocytoclastic vasculitis (CLV) (Figure). I also agreethat she met the American College of Rheumatology's 1990 criteria for a diagnosisof hypersensitivity vasculitis.1 However, given the patient's history and laboratoryresults, I believe further evaluation was warranted to determine whether the medication was indeed to blame for her CLV or whether an underlying systemicdisease was responsible.Her white blood cell (WBC) count was 72,000/?L. CLV is known to producea mild leukocytosis--presumably caused by the inflammatory response of the vasculitis.Thus, one would expect to see only a slight elevation in the WBC count.Also, if the elevation had been produced by the inflammatory response of the CLV,the patient's erythrocyte sedimentation rate (ESR) would have been significantlyelevated. However, her ESR was 12 mm/h, which is essentially normal in awoman this age.The discovery of a value that is not consistent with the disease process makesme question Dr Koon's final diagnosis--or at least want to add to his differentiala disease that could be responsible for both the CLV and the level of leukocytosisseen here: hairy cell leukemia.Other facts in the case that tend not to support the conclusion that the patient'sCLV resulted from a drug reaction include the following:One would expect to see systemic symptoms, such as fever, malaise, anorexia,and/or myalgias if a drug reaction caused the CLV; this woman reportedly didnot experience any of these.Rashes associated with CLV produced by a drug reaction are generally describedby patients as pruritic, painful (sometimes significantly so), and/or associatedwith paresthesias, such as a burning or stinging sensation; this patient's rash isdescribed as "painless and nonpruritic."Thus, although an exogenous agent such as trimethoprim-sulfamethoxazole(TMP-SMX) can cause CLV, it would have been prudent in view of the findingsin this case to search for an endogenous cause, such as an underlying systemicdisease or malignancy.----Pamela Moyers Scott, MPAS, PA-CWilliamsburg, WVaThank you for your comments. You detected a typo; this patient's leukocytecount was actually 7200/?L. A value of 72,000/?L would indeedbe of concern and would prompt a new differential diagnosis. HerWBC count when last checked was 7300/?L.Ultimately, my determination was that the patient's rash was mostlikely triggered by a viral infection and not by the TMP-SMX. I felt that anotherhealth care provider had inappropriately treated her upper respiratory tractinfection with an antibiotic, so I stopped the medication. Because I could notcompletely rule out the antibiotic as a cause of this potentially serious condition,I recommended that she avoid it in the future. This is yet another exampleof how the treatment of colds with antibiotics can confuse the clinical pictureand possibly harm the patient.--Sean Eric Koon, MD  &nbspFontana, Calif

Simple Splatter Solution

All too often, when lancing a sebaceouscyst or abscess, or when relievingpressure from a traumatizednail bed, both practitioner and assistantare splattered with the materialthat is released.

A24-year-old man who worked ina warehouse is brought tothe emergency department following2 days of high fever with rigors, generalizedweakness, and a purplishrash on both lower legs that had progressedrapidly during the past24 hours. He had become ill about5 days previously, with a worseningsore throat and achiness that did notrespond to over-the-counter lozengesand ibuprofen.

Pandemics attributable to different influenza A virus subtypes occurredat irregular intervals throughout the 20th century. Because the timingof a pandemic cannot be predicted, we must be prepared for such an outbreak.Although influenza is generally viewed as an illness with potentiallydeadly effects primarily for elderly persons, it can lead to significant morbidityand mortality in otherwise healthy infants and toddlers and in other highriskgroups.

A 2-month-old infant is brought to the office by his parents becausehe has been crying inconsolably for the past 4 to 5 hours. The childhas been well since birth and has no history of vomiting, diarrhea, fever, orrash. The infant is being breast-fed, is not taking any medication, and hasnot been in contact with any sick persons.

Nutrition and Aging

Good nutritional care can improve the short-and longtermcourses of many illnesses that are common in olderadults. The experts who have contributed to this handbookdiscuss the disorders that can seriously affect andbe affected by nutrition, and they present specific recommendationsfor secondary prevention and management.

A46-year-old white man is hospitalized with increasing dyspnea of 3weeks’ duration. He has a history of stable chronic obstructive pulmonarydisease secondary to heavy smoking (2 packs of cigarettes a day for 27years, discontinued 6 years previously) and uses inhaled bronchodilators.

Use this ABCDE mnemonic to distinguishnecrotizing fasciitis, which usuallyrequires surgery, from cellulitis,which can be treated with antibioticsalone:

For the past month, a 19-year-old woman has had abdominalpain, diarrhea, intermittent fever, and occasionalvomiting. She now seeks medical attention because earlierin the day she noticed a large amount of blood in herstool. She denies trauma, travel to a foreign country, andillicit drug use. She drinks alcohol occasionally but hasnot done so for the past 3 months.