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Inclusion Criteria:

* Weight between 50 and 125 kg
* Mild, stable allergic asthma
* History of episodic wheeze and shortness of breath
* FEV1 at baseline ≥ 70% of the predicted value
* For women of childbearing potential, agreement to use an effective means of contraception while enrolled in the study
* For men with partners of childbearing potential, willingness to use condoms with spermicide during treatment
* Ability to comprehend and follow all required study procedures
* Positive skin prick test to common aeroallergens (e.g., cat, dust, mite, grass, and pollen)
* Positive allergen-induced early and late airway bronchoconstriction

Exclusion Criteria:

* A worsening of asthma or a respiratory tract infection within 6 weeks preceding study entry
* Acute infection (including viral infection) within the 6 weeks preceding dosing (8 weeks for respiratory infections) or any ongoing chronic infection
* History of recurrent bacterial infection as an adult or history or presence of any chronic infectious condition, including (but not limited to), tuberculosis, parasitic infection, etc.
* Lung disease other than mild allergic asthma
* History of heart, lung, kidney, liver, neurologic or chronic infectious disease
* Concomitant disease or condition, which could interfere with the conduct of the study, including, but not limited to, cancer, alcoholism, drug dependency or abuse, or psychiatric disease
* History of serious adverse reaction or hypersensitivity to any drug
* Pregnancy or lactation or positive serum pregnancy test at screening
* Chronic use of any other medication for treatment of allergic lung disease other than short-acting β2-agonists or ipratropium bromide
* Current (or history of) treatment with a monoclonal antibody or chimeric biomolecule within the past 5 months (5 half-lives of the drug), including omalizumab
* Regular use of tobacco products of any kind or within the previous 6 months, or smoking history \> 10 pack-years