🧪 Virus Sample Locations Guide

Collect virus samples to unlock powerful permanent upgrades

Complete guide for all virus sample locations across all campaigns

📊 Virus Sample System Overview

Collection Progress

0 / 30 Virus Samples Collected

Virus samples are account-wide collectibles that permanently unlock powerful upgrades in the Virus Sample Lab.

⚠️ Important: Difficulty Requirement

Virus samples ONLY spawn on Hard difficulty or higher!

Not available on Easy or Normal difficulty
Available on Hard, Insane, and Extreme
Same locations regardless of difficulty (Hard+)
Once collected, permanently unlocked for your account
Can be collected in any order

🏆 Virus Sample Rewards

Each virus sample you collect can be spent in the Virus Sample Lab to unlock permanent upgrades:

Available Upgrades (1 sample each):

Health Boost I-V: +5% health per level (max +25%)
Equipment Cooldown I-V: -3% cooldown per level (max -15%)
Melee Damage I-V: +5% damage per level (max +25%)
Reload Speed I-V: +3% speed per level (max +15%)
Weapon Damage I-V: +2% damage per level (max +10%)
Special Infected Resistance I-V: +10% resistance per level (max +50%)

Note: These upgrades apply to ALL classes and persist across all game modes!

💡 Virus Sample Hunting Tips

Difficulty: Must play on Hard or higher - samples don't spawn on Easy/Normal
Visual Cues: Look for glowing green vials, often in hard-to-reach places
Audio Cues: Samples emit a faint bubbling sound when nearby
Team Collection: Only one player needs to collect it for the whole team
Exploration: Most samples are off the main path - explore thoroughly
Before Defense: Many are placed before triggering defense sequences
Class Choice: Use Slasher for speed or Medic for survivability
Private Lobbies: Use private games to explore without pressure
Checkpoint System: Samples save at checkpoints - you don't need to finish the mission

🔍 Filter by Episode

🗽 New York 4 Virus Samples

Chapter 1: Descent 🧪

Virus Sample #1 HARD+

Location: After leaving the subway tunnels and entering the mall area, before going up the escalators, turn right into the side store (sporting goods shop). The sample is on a shelf in the back corner.

💡 Tip: Easy to miss - make sure to explore the mall thoroughly before ascending the escalators!

Chapter 2: Tunnel Vision 🧪

Virus Sample #2 HARD+

Location: After the first train defense, when you enter the maintenance tunnels, look for a side room on the left with red emergency lighting. The sample is on a workbench inside.

💡 Tip: This room is dark - use your flashlight or look for the green glow!

Chapter 3: Hell and High Water 🧪

Virus Sample #3 HARD+

Location: In the museum section, after entering the main hall with the T-Rex skeleton, go to the second floor balcony. The sample is in a display case on the left side.

💡 Tip: Take the stairs on either side of the T-Rex to reach the second floor!

Chapter 4: Dead in the Water 🧪

Virus Sample #4 HARD+

Location: On the ferry, after clearing the car deck but before going to the upper decks, check the medical bay on the port side (left when facing forward). The sample is in a medical cabinet.

💡 Tip: Look for the red cross signs indicating the medical area!

🏛️ Jerusalem 3 Virus Samples

Chapter 1: Brain Surgery 🧪

Virus Sample #5 HARD+

Location: In the hospital, after taking the elevator to the research floor, enter the laboratory on the right. The sample is on a research table near the microscopes.

💡 Tip: This is before the Greengold rescue - explore the lab thoroughly!

Chapter 2: Dead Sea Stroll 🧪

Virus Sample #6 HARD+

Location: At the archaeological site, after passing through the ruins but before the gas station, look for a research tent on the left side. The sample is on a folding table inside.

💡 Tip: The tent has archaeological equipment and maps inside!

Chapter 3: Tech Support 🧪

Virus Sample #7 HARD+

Location: In the satellite facility, after restoring power but before the rooftop defense, check the server room on the second floor. The sample is behind a row of server racks.

💡 Tip: You'll need to go around the servers to reach this one!

❄️ Moscow 4 Virus Samples

Chapter 1: A Sign From Above 🧪

Virus Sample #8 HARD+

Location: In the museum, after entering through the main hall, go up the stairs to the second floor. The sample is in the restricted area behind a "Staff Only" door on the right.

💡 Tip: Look for the rope barriers - the door is usually nearby!

Chapter 2: Key to the City 🧪

Virus Sample #9 HARD+

Location: After entering the mansion grounds but before the courtyard defense, check the greenhouse on the left side. The sample is among the plants on a potting bench.

💡 Tip: The greenhouse has broken glass panels - look for the intact section!

Chapter 3: Battle of Nerves 🧪

Virus Sample #10 HARD+

Location: In the bunker complex, after passing through the command center, look for a medical station on the right before the final elevator. The sample is in a medical supply crate.

💡 Tip: This is easy to miss if rushing to extraction - check every room!

Chapter 4: Resurrection 🧪

Virus Sample #11 HARD+

Location: In the church area, after clearing the graveyard but before entering the catacombs, check the small chapel on the right. The sample is on the altar.

💡 Tip: The chapel door may be partially hidden by debris!

🗼 Tokyo 4 Virus Samples

Chapter 1: Setting Sun 🧪

Virus Sample #12 HARD+

Location: After the bus crash sequence, before entering the main street, check the convenience store on the right. The sample is behind the counter near the cash register.

💡 Tip: Look for the bright store signs - it's a Family Mart!

Chapter 2: Final Call 🧪

Virus Sample #13 HARD+

Location: On the cruise ship, after clearing the pool deck but before entering the engine room, check the spa area on the upper deck. The sample is in the massage room.

💡 Tip: The spa has a "Wellness Center" sign above the entrance!

Chapter 3: Cruise Control 🧪

Virus Sample #14 HARD+

Location: In the cargo hold, after lowering the first container but before the second crane sequence, check the shipping office on the left. The sample is on a desk with shipping manifests.

💡 Tip: The office has windows overlooking the cargo area!

Chapter 4: Dead Ahead (Aftermath DLC) 🧪

Virus Sample #15 HARD+

Location: In the harbor district, after leaving the warehouse but before the final stand, check the harbor master's office on the pier. The sample is in a locked cabinet (shoot the lock).

💡 Tip: Listen for the sound of glass breaking when you shoot the cabinet!

🇫🇷 Marseille 3 Virus Samples

Chapter 1: French Resistance 🧪

Virus Sample #16 HARD+

Location: In the Fort area, after passing through the armory but before the courtyard defense, check the officer's quarters on the second floor. The sample is in a desk drawer.

💡 Tip: The office has military maps on the walls!

Chapter 2: Missile Command 🧪

Virus Sample #17 HARD+

Location: In the missile silo, after activating the first console but before the second, check the maintenance tunnel on the lower level. The sample is on a tool cart.

💡 Tip: Use the ladder near the first console to access the lower level!

Chapter 3: Last Bastion 🧪

Virus Sample #18 HARD+

Location: At the dam facility, after restoring power but before the final defense, check the control room observation deck. The sample is on a console overlooking the dam.

💡 Tip: The observation deck has large windows with a view of the water!

🏛️ Rome (Aftermath DLC) 3 Virus Samples

Chapter 1: Vatican Visit 🧪

Virus Sample #19 HARD+

Location: In the Vatican archives, after entering the library but before triggering the defense, check the restricted section behind the red rope. The sample is on an ancient manuscript table.

💡 Tip: Look for the ornate golden door - it's usually locked but can be opened!

Chapter 2: Colosseum Crisis 🧪

Virus Sample #20 HARD+

Location: Inside the Colosseum, after entering the arena floor but before going underground, check the emperor's box (elevated seating area). The sample is on a marble pedestal.

💡 Tip: Use the side stairs to reach the elevated seating areas!

Chapter 3: Eternal City 🧪

Virus Sample #21 HARD+

Location: At the Spanish Steps, after clearing the plaza but before the final push, check the luxury boutique on the right. The sample is in the storage room behind the counter.

💡 Tip: The boutique has designer handbags in the window display!

🏔️ Kamchatka (Aftermath DLC) 3 Virus Samples

Chapter 1: Frozen Wasteland 🧪

Virus Sample #22 HARD+

Location: At the research station, after entering the main building but before the generator room, check the biology lab on the second floor. The sample is in a specimen freezer.

💡 Tip: The freezer requires power - make sure the emergency generator is on!

Chapter 2: Ice Breaker 🧪

Virus Sample #23 HARD+

Location: On the icebreaker ship, after clearing the deck but before entering the bridge, check the medical bay below deck. The sample is in a refrigerated medical unit.

💡 Tip: Follow the signs for "Медпункт" (Medical Station in Russian)!

Chapter 3: Volcanic Escape 🧪

Virus Sample #24 HARD+

Location: Near the geothermal plant, after passing the lava flows but before the extraction point, check the monitoring station. The sample is on equipment near seismic monitors.

💡 Tip: The station has warning signs about volcanic activity!

🌵 Phoenix (Aftermath DLC) 3 Virus Samples

Chapter 1: Desert Storm 🧪

Virus Sample #25 HARD+

Location: At the abandoned gas station, after clearing the convenience store but before moving to the motel, check the mechanic's garage. The sample is on a workbench near car parts.

💡 Tip: The garage has a car on the lift - check underneath too!

Chapter 2: Stadium Siege 🧪

Virus Sample #26 HARD+

Location: In the baseball stadium, after reaching the field but before the defense, check the team locker room. The sample is in a player's locker (#42).

💡 Tip: Look for the home team's locker room - it has trophies displayed!

Chapter 3: Canyon Run 🧪

Virus Sample #27 HARD+

Location: At the ranger station near the canyon, after clearing the visitor center but before the bridge sequence, check the gift shop. The sample is hidden behind souvenir displays.

💡 Tip: Move the rotating postcard rack to find this hidden sample!

🎯 Challenge Mode Maps 3 Virus Samples

Hospital Havoc (Weekly Challenge) 🧪

Virus Sample #28 HARD+

Location: In the hospital pharmacy, behind the prescription counter. Only available during specific weekly rotations.

💡 Tip: Check the weekly challenge rotation - this map appears monthly!

Airport Assault (Weekly Challenge) 🧪

Virus Sample #29 HARD+

Location: In the duty-free shop area, check the luxury goods store. The sample is in the storage room.

💡 Tip: Available only during Airport Assault weekly challenges!

Mall Mayhem (Weekly Challenge) 🧪

Virus Sample #30 HARD+

Location: In the food court, check the kitchen of the pizza restaurant. The sample is in the walk-in freezer.

💡 Tip: The freezer door can be tricky - shoot the handle if it won't open!

📈 Collection Summary

Total Samples

Collected

Progress

Upgrades Available

📝 Important Notes

Difficulty Requirement: Virus samples ONLY appear on Hard difficulty or higher
Account-Wide: Once collected, samples are permanent across all characters
Team Collection: Only one player needs to grab the sample for everyone to get credit
Checkpoint Saves: Samples save at checkpoints - you don't need to complete the mission
Visual/Audio Cues: Look for green glowing vials and listen for bubbling sounds
No Respawn Penalty: You keep collected samples even if you fail the mission
Challenge Rotation: Some samples are only available during specific weekly challenges