How can I tell if I am infected?

Over the past two years, the COVID-19 pandemic has been severe; infection can occur easily with even minor exposure. Besides SARS-CoV-2, other viruses also spread readily—sometimes without causing noticeable symptoms, making it difficult to recognize whether one has been infected. So how can you tell if you’re infected? Let’s explore this together.

How to Determine If You Are Infected

To determine whether you have been infected with a virus, observe whether you develop any associated symptoms. Infection with the novel coronavirus (SARS-CoV-2) typically presents with fever, dry cough, and fatigue. Additional symptoms may include nasal congestion or discharge, abdominal pain, and, in more severe cases, shortness of breath.

Infections caused by other viruses commonly manifest as respiratory symptoms, such as cough, sputum production, fever, sore throat, fatigue, and generalized joint pain. Importantly, findings on auxiliary diagnostic tests vary depending on the causative pathogen.

For instance, in bacterial infections, routine blood tests often reveal elevated white blood cell count, neutrophil count, neutrophil percentage, C-reactive protein (CRP), and procalcitonin levels. In contrast, viral infections may lead to decreased white blood cell counts, while lymphocyte and monocyte counts may increase. Mycoplasma pneumoniae infection is typically confirmed by a ≥4-fold rise in mycoplasma antibody titers. Chest X-rays in bacterial pneumonia often show inflammatory infiltrates, whereas viral or atypical pathogen infections (e.g., mycoplasma or chlamydia) may demonstrate interstitial lung changes on chest X-ray or high-resolution CT scans.

The above outlines how to recognize possible viral infection. Regardless of the specific pathogen involved, prompt medical evaluation at a designated hospital is essential when symptoms are severe. Diagnosis should integrate clinical manifestations with relevant laboratory and imaging studies. We hope this information proves helpful to you.