Systemic lupus erythematosus (SLE) pneumonitis mimicking swine influenza pneumonia during the swine influenza (H1N1) pandemic

20-Year-old female with fever, cough, and dyspnea: Acute lupus pneumonitis during the pandemic of coronavirus disease 2019 (COVID-19)

Acute lupus pneumonitis (ALP) is a rare first-presenting manifestation of systemic lupus erythematosus (SLE). The characteristic symptoms are rapid onset of fever, cough (sometimes with hemoptysis), and dyspnea. ALP may progress to acute respiratory distress syndrome (ARDS), and it is a potentially fatal disease unless treated. Coronavirus disease 19 (COVID-19) has overlaps with ALP in terms of clinical presentation, and laboratory and radiological findings. This report describes a case of a young female patient presenting with ARDS during the pandemic of COVID-19. She had pancytopenia, elevated CRP, ferritin, and liver indices resembling macrophage activation syndrome. She also had hepatosplenomegaly, a small spleen infarct, adenopathy, minimal pleural, and pericardial effusion. After excluding COVID-19 by PCR and antibody tests, and other infections by cultures, with the help of antinuclear antibody and anti-double-stranded DNA, SLE and ALP were diagnosed, and she was treated with high-dose steroid and intravenous immunoglobulin. In conclusion, if patients presenting with pneumonia or ARDS have one or more of the findings of arthritis, serositis, rash, oral/nasopharyngeal ulcerations, cytopenias, and renal or neurologic disorder, SLE and ALP should be considered in differential diagnoses. Because of the high mortality rate of ALP reaching up to 50%, early diagnosis and immunosuppressive therapy are of vital importance.

Legionnaire's Disease and its Mimics: A Clinical Perspective

Whenever the cardinal manifestations of a disorder occur in similar disorders, there is potential for a disease mimic. Legionnaire's disease has protean manifestations and has the potential to mimic or be mimicked by other community acquired pneumonias (CAPs). In CAPs caused by other than Legionella species, the more characteristic features in common with legionnaire's disease the more difficult the diagnostic conundrum. In hospitalized adults with CAP, legionnaire's disease may mimic influenza or other viral pneumonias. Of the bacterial causes of CAP, psittacosis and Q fever, but not tularemia, are frequent mimics of legionnaire's disease.

Respiratory syncytial virus (RSV) community-acquired pneumonia (CAP) in a hospitalized adult with human immunodeficiency virus (HIV) mimicking influenza A and Pneumocystis (carinii) jiroveci pneumonia (PCP)

BACKGROUND

Respiratory syncytial virus (RSV) is an important cause of lower respiratory tract infections in young children, the elderly, and immunocompromised hosts, but RSV is a rare cause of community-acquired pneumonia (CAP) in hospitalized adults with human immunodeficiency virus (HIV). In patients with HIV, CAP is most frequently attributable to the usual bacterial respiratory pathogens that cause CAP in immunocompetent hosts, eg, Streptococcuspneumoniae or Hemophilus influenzae. Adults with HIV are also predisposed to intracellular CAP pathogens, ie, Mycoplasmatuberculosis, Salmonella spp., Pneumocystis (carinii) jiroveci (PCP), cytomegalovirus, and Legionella spp. This year, co-circulating in the community during influenza season were strains of human seasonal influenza A (H3N2) and swine influenza A (H1N1). During the influenza season, in adults hospitalized with HIV, the diagnostic possibilities should include influenza-like illnesses, eg, human parainfluenza virus types 3 and 4, human metapneumovirus, and pertussis.

CASE REPORT

We present an adult with HIV, hospitalized for an influenza-like illness during influenza season. The differential diagnosis of CAP in this patient included influenza A and PCP.

CONCLUSION

We report on an adult patient with HIV with CAP that mimicked influenza and PCP, and was attributable to RSV.