Reviewed by medical experts • For informational purposes only
Local signs where the infection sits, whole-body signs as you fight it, and the sepsis and meningitis danger signs that mean call 112/102.
Bacterial infections speak in two voices: local signs where the infection sits, and whole-body signs as the body fights. Learning both - and especially the signs of spread - tells you when home care ends and the doctor begins.
Call 112 or 102, or reach an emergency department immediately, for:
These are the signs of sepsis and meningitis - conditions where hours decide outcomes. See NHS guidance on sepsis.
Classical texts listed remarkably precise danger signs (Arishta Lakshana) in severe fevers: continuous high fever with loss of consciousness, delirium (Pralapa), severe breathlessness, cold limbs with burning internal heat, dark spots or blisters on the skin (Kotha), bleeding, unquenchable thirst and rapid wasting - Madhava Nidana, Chapter 2; Charaka Samhita, Chikitsa Sthana 3. Ancient clinicians without a single microscope knew which fevers kill; modern sepsis protocols chase the same signs.
Is green phlegm proof of bacterial infection? No - colour alone proves nothing; viral infections also produce coloured phlegm. Duration, fever pattern and examination matter more than the colour chart.
How long is too long for a fever? Any fever beyond 3 days without improvement, fever with danger signs at any point, or fever in an infant under 3 months - all need a doctor. Typhoid and TB classically present as fevers that simply do not settle.
What does a non-fading rash mean? Press a glass against it: a rash that does not blanch (fade) can signal meningococcal sepsis - treat it as an emergency and get to hospital immediately.
Are chills dangerous? Rigors themselves are common with rising fevers, including malaria and urinary infections. Chills plus confusion, breathlessness or the danger signs above make it an emergency.
Written By
Dr. Daksh
BDS
Reviewed By
Dr. Varun Gupta
MD Pharmacology, MBBS
Last updated on
27 Sep 2022 • 06:23 PM (IST)
Read Our Editorial Policy
Want to know more?
Have issue with the content?
Report Problem
Explore more articles about this topic
From local invasion to spreading infection to sepsis: how bacterial infections progress, and why early treatment changes the whole trajectory.
Skin, chest, urinary, gut, blood and more: the types of bacterial infection by site and behaviour - and why TB is in a class of its own.
Soap, safe water, thoroughly cooked food, vaccines (typhoid, pneumococcal, Td) - most bacterial infections are preventable. The habits that do it.
Antibiotics treat bacterial infection - full stop. What classical fever care, wound wisdom and herbs genuinely add afterwards, and what they must never replace.
Enough harmful bacteria, a way in, and defences too weak to stop them - the causes of bacterial infection, and how antibiotic misuse breeds harder ones.
Abscesses, sepsis, kidney injury, rheumatic fever, typhoid perforation - the complications of bacterial infection, and the delay that causes them all.
