The following guides shows how to beat Teleportation Scenario with 3 Biohazard Signs on Casual.
I tried it 2 times and it worked fine.
Just evolve the following genes in the order below always when you get enough DNA.
Don't devolve any mutations.
Have fun.

If you have any suggestion, questions or critique put them in the comments below.

Plague:
• Bacteria

Genetic codes:
• ATP Boost
• Genetic Mimic
• Aerocyte
• Extremophilie
• Sympto-Stasis

Start Country:
• Saudi Arabia

Transmissions:
• Air 1

Symptoms:
• Rash
• Sweating
• Skin Lesions

Transmissions:
• Air 2
• Water 1

Symptoms:
• Necrosis

• Cysts
• Hyper Sensitivity
• Abscesses

Abilities:
• Drug Resistance 1
• Cold Resistance 1
• Cold Resistance 2

Symptoms:
• Coughing
• Pneumonia
• Sneezing

Transmissions:
• Water 2
• Extreme Bioaerosol

Symptoms:
• Cysts
• Abscesses
• Hyper Sensitivity

Abilities:
• Drug Resistance 2

Symptoms:
• Insomnia
• Paranoia
• Seizures
• Insanity

• Nausea
• Vomiting
• Pulmonary Oedema
• Diarrhoea
• Dysentery

• Paralysis
• Coma
• Total Organ Failure

Transmissions:
• Rodent 1
• Livestock 1
• Insect 1

Symptoms:
• Systemic Infection
• Tumours
• Internal Haemorrhaging

• Immune Suppression

Wait until you have won.