Day 8+ Advanced Symptoms
Master laboratory mechanics and unlock hidden symptoms to survive the late game
The Late-Game Challenge
Day 7-8 marks a major turning point in Quarantine Zone. The Laboratory opens, revealing symptoms that were previously invisible to you. Without discovering these hidden symptoms, you'll miss infections and lose survivors. This guide covers everything you need to master late-game detection.
What Changes at Day 7-8
Laboratory Access
Discover hidden symptoms by extracting infected organs from suspects
Contraband Inspection
Must now check backpacks for weapons, drugs, and contaminated body parts
Bulletin Board Requests
Special missions appear that add complexity to your decisions
More Symptom Combinations
Survivors start showing multiple symptoms across different tools
Tool Unlock Timeline
Each tool unlocks on specific days. Know what you can detect and when.
Symptoms Requiring Laboratory Discovery
These symptoms are INVISIBLE until you discover them in the Laboratory. Send survivors with unknown symptoms to the lab to unlock detection.
Appearance
Rash-like misshapen splotches, brown/red, no zits
Rash full of zits and whiteheads with small splotches
Blood on lower lip running toward chin
Small green pus drop on corner of eye (very hard to see)
Green pus dripping from nostril
Stethoscope
Wheeze during BOTH inhale AND exhale
Zombie growling instead of breathing sounds
X-Ray
Yellow splotches on organ (ignore pancreas)
Purple or pinkish organ color
Teal blue colored organ
Dark black splotches on organ
Behavioral Cues
Watch for these behaviors to know where to look for symptoms:
| Behavior | Check Area |
|---|---|
| Dropped jaw / slack mouth | Use Hammer - reflex symptoms |
| Grabbing stomach | Use X-Ray - organ symptoms |
| Coughing / sneezing / hiccupping | Use Thermopulsometer or Stethoscope |
| Droopy / half-closed eyes | Use Matioscope - eye organisms |
Critical Distinctions
Don't confuse these similar-looking symptoms:
Bruises vs Red Bruise vs Necrosis
Bruises: Blue-green-yellow mix
Red Bruise: Dark red splotches
Necrosis: Black splotches (not tattoos!)
Eye Conditions
Yellow Eyes: Yellow-tinted whites
Conjunctivitis: Red corners only
Red Eyes: Entirely bright red whites
Breathing Sounds
Sickly Breath: Wheeze on inhale only
Nonspecific: Wheeze on both inhale AND exhale
Infected: Zombie growling sound
Advanced Detection Tips
Temperature Timing
Temperature takes 5-7 seconds to stabilize. The initial reading is WRONG - wait for it to stop rising!
Green Skin Looks Yellow
Despite the name, 'Green Skin' actually appears yellow like a Simpson character. Compare with ID photo (Tab).
Don't Mistake Tattoos
Black tattoos can look like Necrosis. Look for artistic patterns, faces, symbols, or words.
Matioscope Shape > Color
Eye organisms may appear in different colors than the symptom list shows. Focus on their SHAPE, not color.
Hidden Symptom Locations
Check backs, under arms, feet, and behind clothing. Use the Scanner to see through clothes.
UV-Only Symptoms
Some bites, necrosis, and pus are INVISIBLE normally. Always use UV Tower to reveal hidden red symptoms.
Symptom Scanner (Late-Game Upgrade)
Upgrade your entrance scanner to detect symptom categories. If a symbol lights up, check that tool. If it doesn't light up, skip that check entirely.
Scanner can rarely have false negatives. Trust it 99% of the time, but stay alert.