Infection with a second strain of Dengue fever virus within two years of having had the first strain causes Dengue Hemorrhagic Fever.

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This is true. When a person is infected with a second strain of Dengue fever virus within two years of having had the first strain, the risk of developing Dengue Hemorrhagic Fever increases. This is because the body produces antibodies against the first strain, but these antibodies are not effective against the second strain, and may actually enhance the uptake of the virus into the cells, leading to more severe symptoms.

Infection with a Second Strain of Dengue Fever Virus Within