Upper Respiratory Tract Infection (URTI): Given the symptoms of fever, chills, running nose, and the duration of 3 days, URTI, commonly known as the common cold, is the most likely diagnosis. It's a viral infection that affects the upper respiratory system and is highly prevalent.

Influenza: The symptoms of fever, chills, and running nose could also suggest influenza, especially during flu season. Influenza can present similarly to URTI but often has a more abrupt onset and can be more severe.
Sinusitis: If the symptoms persist or worsen, sinusitis could be a consideration. It's an infection of the sinuses that can cause fever, facial pain, and nasal congestion.
Pharyngitis: Although not directly mentioned, if the patient has a sore throat, pharyngitis (throat infection) could be another likely diagnosis, often caused by viruses but sometimes by bacteria like Streptococcus.

Pneumonia: While less likely given the initial presentation, pneumonia is a critical diagnosis not to miss. It can present with similar symptoms but often includes cough, shortness of breath, and can be much more severe, especially in older adults or those with underlying health conditions.
COVID-19: Given the current pandemic, COVID-19 should be considered, especially if the patient has been exposed or has risk factors. Symptoms can range from mild to severe and include fever, chills, and respiratory symptoms.
Meningitis: Although rare and typically presenting with more severe symptoms like severe headache, stiff neck, and confusion, meningitis is a life-threatening condition that must be considered, especially if the patient's condition rapidly deteriorates.

Lemierre's Syndrome: A rare condition that starts with a sore throat and can progress to include fever, neck pain, and swelling, due to a bacterial infection.
Tuberculosis (TB): While rare in many parts of the world, TB can present with chronic respiratory symptoms, including cough, fever, and weight loss. It's more likely in individuals with certain risk factors, such as immunocompromised states or recent travel to areas where TB is common.

Detailed Symptom History: Ask about the onset, duration, and severity of symptoms, including any recent travel or exposure history.
Past Medical History: Inquire about any chronic conditions, immunocompromised states, or previous illnesses that could impact the current condition.
Medication History: Ask about any current medications, including supplements and over-the-counter drugs.
Physical Examination Findings: Although limited in a teleconsultation, ask the patient about any observations they've made, such as difficulty breathing, chest pain, or severe headache.
Diagnostic Tests: Depending on the suspicion of certain conditions, recommend appropriate diagnostic tests, such as a rapid influenza test, COVID-19 test, or chest X-ray if pneumonia is suspected.
Treatment and Follow-Up: Provide guidance on symptom management and arrange for follow-up to monitor the patient's condition and adjust the treatment plan as necessary.