Infectious mononucleosis is a clini...

Infectious mononucleosis is a clinical syndrome caused according to Epstein-Barr virus (EBV) that is particularly everyday in adolescents and children. Typical features of infectious mononucleosis include febrile affection pharyngitis, adenopathy, malaise, and an atypical lymphocytosis. Splenomegaly, hepatomegaly, jaundice, and splenic breach can occur in patients with infectious mononucleosis, nevertheless these complications are rare. (1)

Data accumulateed more than 30 years ago in succession the incidence of infectious mononucleosis indicate the highest rates in bodily forms 10 to 19 years of age (six to eight cases by means of 1,000 persons per year). (2 3) The incidence in bodily substances younger than 10 years and older than 30 years is les than the same case per 1,000 persons by year, (2, 3) but mild infections in younger children frequently may be undiagnosed. The infection is principally common in populations with many young adults, like as active-duty military personnel and body students, in whom the annual incidence for infectious mononucleosis ranges from 11 to 48 cases through 1,000 persons. (4, 5)

Infectious mononucleosis is relatively rare in adults, accounting for les than 2 percent of all adults presenting with sore throat. (6) Family physicians should await to diagnose one to four patients with infectious mononucleosis by means of year, depending on the number of adolescents in their practice. (3 5) The incidence of infectious mononucleosis point outs no consistent seasonal peak. (2)

Etiology and Pathophysiology

EBV is a herpes virus that replicates primarily in [beta]-lymphocytes further also may replicate in the epithelial small cavitys of the pharynx and parotid pipe (7) The infection is spread primarily from saliva, and the incubation period is four to eight weeks. In an acute infection, heterophile antibodies that agglutinate sheep erythrocyte are produc This proces forms the basis for the Monospot rapid latex agglutination example Antibodies to viral capsid antigen (i.e., VCA-IgG and VCA-IgM) are produc slightly earlier than the heterophile antibody and are more specific for EBV infection. The VCA-IgG antibody persists past the stage of acute infection and signals the disclosure of immunity. (7)

Diagnosis

TYPICAL PRESENTATION

In a series of 500 patients with confirmed infectious mononucleosis, at least 98 percent had sore throat, lymph node enlargement, heat and tonsillar enlargement. (8) Other for the use of all physical signs included pharyngeal inflammation (85 percent) and transient palatal petechiae (50 percent) (8) This presentation is typical in adolescents. Older adults are les likely to have sore throat and adenopathy if it be not that more likely to have hepatomegaly and jaundice. (9)

DIAGNOSTIC CRITERIA FOR INFECTIOUS MONONUCLEOSIS

Hoagland's criteria (8) for the diagnosis of infectious mononucleosis are the greatest in number widely cited: at least 50 percent lymphocyte and at least 10 percent atypical lymphocyte in the neighborhood of fever, pharyngitis, and adenopathy, and confirmed according to a positive serologic test. While quite specific, these criteria are not highly sensitive and are greatest in number useful for research purposes. (6 10) barely about one half of patients with symptoms suggestive of infectious mononucleosis and a positive heterophile antibody proof meet all of Hoagland's criteria.

DIFFERENTIAL DIAGNOSIS

Patients with streptococcal pharyngitis or single of several viral pharyngitides instant with sore throat, fatigue, and adenopathy. Acute cytomegalovirus (CMV) infection and toxoplasmosis can share many additional characteristics with infectious mononucleosis, including splenomegaly, hepatomegaly, lymphocytosis, atypical lymphocytosis, and unruffled false-positive results from a heterophile antibody touchstone (11) It may not be possible--or unruffled useful--to distinguish between infectious mononucleosis caused by the agency of EBV infection and an infectious mononucleosis--like syndrome caused on toxoplasmosis or CMV, because the management of these syndrome is the same. However, diagnostic testing is warranted in pregnant women because toxoplasmosis and acute human immunodeficiency virus (HIV) and CMV infections are associated with significant pregnancy complications.

Symptoms of acute HIV infection can imitate those of infectious mononucleosis. If acute HIV infection is suspected, a quantitative polymerase chain reaction experiment should be performed. The differential diagnosis for suspected infectious mononucleosis is summarized in Table 1 (12)

[i]clavis[/i] DIAGNOSTIC FEATURES

hardly any well-designed studies have been con-duct to determine the value of clinical examination in patients with infectious mononucleosis in the primary care setting. The best reflection is a series including more than 700 patients 16 years of age and older with sore throat, 15 of whom were build to have infectious mononucleosis onward the basis of a positive heterophile antibody experiment (6) The diagnostic accuracy of different signs and symptoms associated with infectious mononucleosis is summarized in Table 2 (6)

[TABLE 2 OMITTED]

The mien of splenomegaly, posterior cervical adenopathy, axillary adenopathy, and inguinal adenopathy is greatest in number useful in considering the possibility of infectious mononucleosis, while the absence of cervical adenopathy and fatigue is principally helpful in dismissing the diagnosis. Infectious mononucleosis should be suspected and a diagnostic evaluation obtained in febrile patients who have sore throat plus splenomegaly, palatal petechiae, or posterior, axillary, or inguinal adenopathy. (6) A modern study (13) con-firmed this recommendation, although axillary and inguinal adenopathy were plant less often in the consideration population.